开发者

Custom delegate

I want to know how can I开发者_Go百科 use a custom delegate?


Maybe an example will help you:

#import <UIKit/UIKit.h>
@protocol VSKeypadViewDelegate
@required
-(int)numberOfRows;
-(int)numberOfColumns;

-(NSString*)titleForButtonOnRow:(int)row andColumn:(int)column;
-(id)valueForButtonOnRow:(int)row andColumn:(int)column;
-(CGSize)sizeForButtonOnRow:(int)row andColumn:(int)column;
-(void)receivedValue:(id)value;
-(CGPoint)keypadOrigin;

@optional
-(NSArray *)additionalButtonsForKeypad;
//-(UIColor *)keypadBackgroundColor;
//-(UIColor *)keyBackgroundColorForRow:(int)row andColumn:(int)Column;
-(UIImage *)backgroundImageForState:(UIControlState)state forKeyAtRow:(int)row andColumn:(int)column;
-(BOOL)isButtonEnabledAtRow:(int)row andColumn:(int)column;

@end


@interface VSKeypadView : UIView {
    id<VSKeypadViewDelegate> delegate;
    NSArray *keypadButtons;
}

+ (VSKeypadView *)keypadViewWithFrame:(CGRect)r;

- (id)initWithFrame:(CGRect)r ;
-(void)fireKeypadButton:(id)sender;

@property(nonatomic, assign) id<VSKeypadViewDelegate> delegate;

@end

This is a keypad I wrote.
The VSKeyPadView derives from UIView and has a delegate ivar of type id<VSKeypadViewDelegate>, that means, that the object set to delegate is expected to conform to the protocol VSKeypadViewDelegate. That protocol has some required and some optional method. That means, that it is your responsibility to write those method — what ever makes sense for you.

You will find this code running in an example application at github.

0

上一篇:

下一篇:

精彩评论

暂无评论...
验证码 换一张
取 消

最新问答

问答排行榜