UI CONTROLS
1.Control: LABELProperties: textColor, highlighted, text, BackgroundColor, font size, font color ,shadow color.
Methods:
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines;
- (void)drawTextInRect:(CGRect)rect;
Delegate Methods: NIL
2.Control: Button
Properties:
Type- Custom,Rounded Rect,Detail disclosure, info light ,info dark,Add contact
Title-title that appears to be on button.
Image- keep image as a button..
Background-background image of button..
Font-selected font style,size etc.,
Text color- the color of text that appears on button.
Alignment- text alignment that appears on button.
Methods:
- (void)setTitle:(NSString *)title forState:(UIControlState)state; // default is nil. title is assumed to be single line
- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state; // default if nil. use opaque white
- (void)setTitleShadowColor:(UIColor *)color forState:(UIControlState)state; // default is nil. use 50% black
- (void)setImage:(UIImage *)image forState:(UIControlState)state; // default is nil. should be same size if different for different states
- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state; // default is nil
- (NSString *)titleForState:(UIControlState)state; // these getters only take a single state value
- (UIColor *)titleColorForState:(UIControlState)state;
- (UIColor *)titleShadowColorForState:(UIControlState)state;
- (UIImage *)imageForState:(UIControlState)state;
- (UIImage *)backgroundImageForState:(UIControlState)state;
- (CGRect)backgroundRectForBounds:(CGRect)bounds;
- (CGRect)contentRectForBounds:(CGRect)bounds;
- (CGRect)titleRectForContentRect:(CGRect)contentRect;
- (CGRect)imageRectForContentRect:(CGRect)contentRect;
Delegate Methods: NIL
3.Control:TEXTFIELD
Properties:
Text- entered text in text field.
placeholder text- display text in background.
Background-background image of textfield..
Font-selected font style,size etc.,
Text color- the color of text that appears on textfield.
Alignment- text alignment that appears on textfield.
Methods:
// drawing and positioning overrides
- (CGRect)borderRectForBounds:(CGRect)bounds;
- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)placeholderRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
- (CGRect)clearButtonRectForBounds:(CGRect)bounds;
- (CGRect)leftViewRectForBounds:(CGRect)bounds;
- (CGRect)rightViewRectForBounds:(CGRect)bounds;
- (void)drawTextInRect:(CGRect)rect;
- (void)drawPlaceholderInRect:(CGRect)rect;
// Presented when object becomes first responder. If set to nil, reverts to following responder chain. If
// set while first responder, will not take effect until reloadInputViews is called.
@property (readwrite, retain) UIView *inputView;
@property (readwrite, retain) UIView *inputAccessoryView;
Delegate Methods:
@optional
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.
- (void)textFieldDidBeginEditing:(UITextField *)textField; // became first responder
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField; // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
- (void)textFieldDidEndEditing:(UITextField *)textField; // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string; // return NO to not change text
- (BOOL)textFieldShouldClear:(UITextField *)textField;
// called when clear button pressed. return NO to ignore (no notifications)
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
[textfieldname resignFirstResponder];
return YES;
} // called when 'return' key pressed. return NO to ignore.
4.Control:Segmented Control
Properties:
Style-plain,bordered,bezeled,bar
State- momentary while selecting..
Segments-no. of segments
Segment -segment title
Image- keep image for each segment..
Methods:- (void)insertSegmentWithTitle:(NSString *)title atIndex:(NSUInteger)segment animated:(BOOL)animated; // insert before segment number. 0..#segments. value pinned
- (void)insertSegmentWithImage:(UIImage *)image atIndex:(NSUInteger)segment animated:(BOOL)animated;
- (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
- (void)removeAllSegments;
- (void)setTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment; // can only have image or title, not both. must be 0..#segments - 1 (or ignored). default is nil
- (NSString *)titleForSegmentAtIndex:(NSUInteger)segment;
- (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment; // can only have image or title, not both. must be 0..#segments - 1 (or ignored). default is nil
- (UIImage *)imageForSegmentAtIndex:(NSUInteger)segment;
- (void)setWidth:(CGFloat)width forSegmentAtIndex:(NSUInteger)segment; // set to 0.0 width to autosize. default is 0.0
- (CGFloat)widthForSegmentAtIndex:(NSUInteger)segment;
- (void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment; // adjust offset of image or text inside the segment. default is (0,0)
- (CGSize)contentOffsetForSegmentAtIndex:(NSUInteger)segment;
- (void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment; // default is YES
- (BOOL)isEnabledForSegmentAtIndex:(NSUInteger)segment;
Delegate Methods:NIL
5.Control:Switch
Properties:
State-on&off
On tint:Switch color
Methods:
- (id)initWithFrame:(CGRect)frame; // This class enforces a size appropriate for the control. The frame size is ignored.
- (void)setOn:(BOOL)on animated:(BOOL)animated; // does not send action
Delegate Methods:NIL
6.Control:Slider
Properties:Values minimum to maximum And current ..
Methods:
- (void)setValue:(float)value animated:(BOOL)animated; // move slider at fixed velocity (i.e. duration depends on distance). does not send action
// set the images for the slider. there are 3, the thumb which is centered by default and the track. You can specify different left and right track
// e.g blue on the left as you increase and white to the right of the thumb. The track images should be 3 part resizable (via UIImage's resizableImage methods) along the direction that is longer
- (CGRect)minimumValueImageRectForBounds:(CGRect)bounds;
- (CGRect)maximumValueImageRectForBounds:(CGRect)bounds;
- (CGRect)trackRectForBounds:(CGRect)bounds;
- (CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value;
Delegate Methods:NIL
7.Control:Progress View
Properties:Style-default,bar
Progress-0 to 1
methods:
- (void)setProgress:(float)progress animated:(BOOL)animated __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
Delegate Methods:NIL
8.Control: Activity Indicator View
Properties:
Style-gray,White,large White
Behavior- animating ,hides when stopped
Methods:
- (void)startAnimating;
- (void)stopAnimating;
- (BOOL)isAnimating;
Delegate Methods:NIL
9.Control: Stepper
Properties:
Value -minimum, maximum, current ,step
Methods:NIL
Delegate Methods:NIL
10.Control:Table View
Properties:
Style-plain,Grouped
Separator-Single line, single line etched
Selection-No selection,single selection,multiple selection
Editing-No selection During Editing, single selection During Editing, multiple selection During Editing
For scrollers
Style-white,black
Scrollers-shows horizontal scrollers,shows vertical scrollers,scrolling enabled,paging enabled,Direction Lock Enabled
Bounces-Bounces,Bounces horizontally,Bounces vertically
Zoom-min-max
Touches- Bounces Zoom,Delays Content touches, Cancelable Content To..
Methods:
- (id)initWithFrame:(CGRect)frame style:(UITableViewStyle)style; // must specify style at creation. -initWithFrame: calls this with UITableViewStylePlain
- (void)reloadData; // reloads everything from scratch. redisplays visible rows. because we only keep info about visible rows, this is cheap. will adjust offset if table shrinks
- (void)reloadSectionIndexTitles __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0); // reloads the index bar.
// Info
- (NSInteger)numberOfSections;
- (NSInteger)numberOfRowsInSection:(NSInteger)section;
- (CGRect)rectForSection:(NSInteger)section; // includes header, footer and all rows
- (CGRect)rectForHeaderInSection:(NSInteger)section;
- (CGRect)rectForFooterInSection:(NSInteger)section;
- (CGRect)rectForRowAtIndexPath:(NSIndexPath *)indexPath;
- (NSIndexPath *)indexPathForRowAtPoint:(CGPoint)point; // returns nil if point is outside table
- (NSIndexPath *)indexPathForCell:(UITableViewCell *)cell; // returns nil if cell is not visible
- (NSArray *)indexPathsForRowsInRect:(CGRect)rect; // returns nil if rect not valid
- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath; // returns nil if cell is not visible or index path is out of range
- (NSArray *)visibleCells;
- (NSArray *)indexPathsForVisibleRows;
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
- (void)scrollToNearestSelectedRowAtScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
// Row insertion/deletion/reloading.
- (void)beginUpdates; // allow multiple insert/delete of rows and sections to be animated simultaneously. Nestable
- (void)endUpdates; // only call insert/delete/reload calls or change the editing state inside an update block. otherwise things like row count, etc. may be invalid.
- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
- (void)reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
- (void)moveRowAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
// Editing. When set, rows show insert/delete/reorder controls based on data source queries
@property(nonatomic,getter=isEditing) BOOL editing; // default is NO. setting is not animated.
- (void)setEditing:(BOOL)editing animated:(BOOL)animated;
@property(nonatomic) BOOL allowsSelection __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0); // default is YES. Controls whether rows can be selected when not in editing mode
@property(nonatomic) BOOL allowsSelectionDuringEditing; // default is NO. Controls whether rows can be selected when in editing mode
@property(nonatomic) BOOL allowsMultipleSelection __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0); // default is NO. Controls whether multiple rows can be selected simultaneously
@property(nonatomic) BOOL allowsMultipleSelectionDuringEditing __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_5_0); // default is NO. Controls whether multiple rows can be selected simultaneously in editing mode
// Selection
- (NSIndexPath *)indexPathForSelectedRow; // returns nil or index path representing section and row of selection.
- (NSArray *)indexPathsForSelectedRows __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_5_0); // returns nil or a set of index paths representing the sections and rows of the selection.
// Selects and deselects rows. These methods will not call the delegate methods (-tableView:willSelectRowAtIndexPath: or tableView:didSelectRowAtIndexPath:), nor will it send out a notification.
- (void)selectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(UITableViewScrollPosition)scrollPosition;
- (void)deselectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated;
// Appearance
@property(nonatomic) NSInteger sectionIndexMinimumDisplayRowCount; // show special section index list on right when row count reaches this value. default is NSInteger Max
@property(nonatomic) UITableViewCellSeparatorStyle separatorStyle; // default is UITableViewCellSeparatorStyleSingleLine
@property(nonatomic,retain) UIColor *separatorColor; // default is the standard separator gray
@property(nonatomic,retain) UIView *tableHeaderView; // accessory view for above row content. default is nil. not to be confused with section header
@property(nonatomic,retain) UIView *tableFooterView; // accessory view below content. default is nil. not to be confused with section footer
- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier; // Used by the delegate to acquire an already allocated cell, in lieu of allocating a new one.
// when a nib is registered, calls to dequeueReusableCellWithIdentifier: with the registered identifier will instantiate the cell from the nib if it is not already in the reuse queue
- (void)registerNib:(UINib *)nib forCellReuseIdentifier:(NSString *)identifier __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
@end
Delegate Methods:
@optional
// Display customization
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath;
// Variable height support
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section;
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section;
// Section header & footer information. Views are preferred over title should you decide to provide both
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section; // custom view for header. will be adjusted to default or specified header height
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section; // custom view for footer. will be adjusted to default or specified footer height
// Accessories (disclosures).
- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_NA,__MAC_NA,__IPHONE_2_0,__IPHONE_3_0);
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath;
// Selection
// Called before the user changes the selection. Return a new indexPath, or nil, to change the proposed selection.
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath;
- (NSIndexPath *)tableView:(UITableView *)tableView willDeselectRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
// Called after the user changes the selection.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
// Editing
// Allows customization of the editingStyle for a particular cell located at 'indexPath'. If not implemented, all editable cells will have UITableViewCellEditingStyleDelete set for them when the table has editing property set to YES.
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath;
- (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
// Controls whether the background is indented while editing. If not implemented, the default is YES. This is unrelated to the indentation level below. This method only applies to grouped style table views.
- (BOOL)tableView:(UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath;
// The willBegin/didEnd methods are called whenever the 'editing' property is automatically changed by the table (allowing insert/delete/move). This is done by a swipe activating a single row
- (void)tableView:(UITableView*)tableView willBeginEditingRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)tableView:(UITableView*)tableView didEndEditingRowAtIndexPath:(NSIndexPath *)indexPath;
// Moving/reordering
// Allows customization of the target row for a particular row as it is being moved/reordered
- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath;
// Indentation
- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath; // return 'depth' of row for hierarchies
// Copy/Paste. All three methods must be implemented by the delegate.
- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
@end
DataSource Methods:
@required
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
@optional
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView; // Default is 1 if not implemented
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section; // fixed font style. use custom view (UILabel) if you want something different
- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section;
// Editing
// Individual rows can opt out of having the -editing property set for them. If not implemented, all rows are assumed to be editable.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath;
// Moving/reordering
// Allows the reorder accessory view to optionally be shown for a particular row. By default, the reorder control will be shown only if the datasource implements -tableView:moveRowAtIndexPath:toIndexPath:
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath;
// Index
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView; // return list of section titles to display in section index view (e.g. "ABCD...Z#")
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index; // tell table which section corresponds to section title/index (e.g. "B",1))
// Data manipulation - insert and delete support
// After a row has the minus or plus button invoked (based on the UITableViewCellEditingStyle for the cell), the dataSource must commit the change
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath;
// Data manipulation - reorder / moving support
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath;
@end
11.Control:Table View Cell-Defines the attributes and behavior of cells(rows)
Properties:
Style-custom,basic,right detail,left detail,Sub title
Selection-None,gray,blue
Accessory-disclosure indicator,detail disclosure,checkbox.
Editing Acc.-disclosure indicator,detail disclosure,checkbox.
Methods:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated;
Delegate Methods:NIL
12.Control:ImageView:
properties:
image-to keep the image as a background
Methods:
- (id)initWithImage:(UIImage *)image;
- (id)initWithImage:(UIImage *)image highlightedImage:(UIImage *)highlightedImage __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
- (void)startAnimating;
- (void)stopAnimating;
- (BOOL)isAnimating;
Delegate Methods:NIL
13.Control:TextView
Properties:
text-write text to display
behavior-editable
capitalization-sentences, words, capital letters
detection:links,address,phone numbers,events
Delegate:(optional)
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView;
- (BOOL)textViewShouldEndEditing:(UITextView *)textView;
- (void)textViewDidBeginEditing:(UITextView *)textView;
- (void)textViewDidEndEditing:(UITextView *)textView;
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text;
- (void)textViewDidChange:(UITextView *)textView;
- (void)textViewDidChangeSelection:(UITextView *)textView;
14.control:web view
properties:scaling-scales page to fit
detection:links,address,phone numbers,events
delegate:(optional)
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
- (void)webViewDidStartLoad:(UIWebView *)webView;
- (void)webViewDidFinishLoad:(UIWebView *)webView;
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;
15.control:scroll view
properties-
style-default,white,black
scrollers-shows horizontal scrollers,shows vertical scrollers,scrolling enabled,paging enabled,detection lock enabled.
bounce-bounces,bounces horizontally,bounces vertically.
Zoom-min to max
touch-bounces,bounces horizontally,bounces vertically
interaction-user interaction enabled,multiple touch
drawing-opaque,hidden,clears graphics context,clip subviews,auto resize subviews.
methods
delegate:- (void)scrollViewDidScroll:(UIScrollView *)scrollView; // any offset changes
- (void)scrollViewDidZoom:(UIScrollView *)scrollView __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_2); // any zoom scale changes
// called on start of dragging (may require some time and or distance to move)
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;
// called on finger up if the user dragged. velocity is in points/second. targetContentOffset may be changed to adjust where the scroll view comes to rest. not called when pagingEnabled is YES
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
// called on finger up if the user dragged. decelerate is true if it will continue moving afterwards
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView; // called on finger up as we are moving
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView; // called when scroll view grinds to a halt
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView; // called when setContentOffset/scrollRectVisible:animated: finishes. not called if not animating
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView; // return a view that will be scaled. if delegate returns nil, nothing happens
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_2); // called before the scroll view begins zooming its content
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale; // scale between minimum and maximum. called after any 'bounce' animations
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView; // return a yes if you want to scroll to the top. if not defined, assumes YES
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView; // called when scrolling animation finished. may be called immediately if already at top
16 control:date picker
properties:mode-date and time
locale-english(united states)
interval-time in minutes
date&time-
constraints-min &max dates
timer- count down in seconds
interaction-user interaction enabled,multiple touch
drawing-opaque,hidden,clears graphics context,clip subviews,auto resize subviews.
content-selected ,enabled,highlighted
methods:- (void)setDate:(NSDate *)date animated:(BOOL)animated; // if animated is YES, animate the wheels of time to display the new date
17control: picker View
behavior-shows selection indicator
interaction-user interaction enabled,multiple touch
drawing-opaque,hidden,clears graphics context,clip subviews,auto resize subviews.
methods:// Reloading whole view or single component
- (void)reloadAllComponents;
- (void)reloadComponent:(NSInteger)component;
// selection. in this case, it means showing the appropriate row in the middle
- (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated; // scrolls the specified row to center.
- (NSInteger)selectedRowInComponent:(NSInteger)component; // returns selected row. -1 if nothing selected
Delegate:
// returns width of column and height of row for each component.
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component;
// these methods return either a plain UIString, or a view (e.g UILabel) to display the row for the component.
// for the view versions, we cache any hidden and thus unused views and pass them back for reuse.
// If you return back a different object, the old one will be released. the view will be centered in the row rect
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view;
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component;
tags:ui controls in ios, uikit framework reference, uikit framework reference,ios concepts,ios controls library,ios controls
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