Alert Block方法.

最新推荐文章于 2025-03-11 09:10:17 发布

原创最新推荐文章于 2025-03-11 09:10:17 发布 · 730 阅读

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#alert block

这篇博客介绍了如何在Objective-C中使用Block来创建和处理Alert视图，详细阐述了在.h和.m文件中的实现过程。

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.h文件

-(void) handlerClickedButton:(void (^)(NSInteger btnIndex))aBlock;
-(void) handlerCancel:(void (^)(void))aBlock;
-(void) handlerWillPresent:(void (^)(void))aBlock;
-(void) handlerDidPresent:(void (^)(void))aBlock;
-(void) handlerWillDismiss:(void (^)(NSInteger btnIndex))aBlock;
-(void) handlerDidDismiss:(void (^)(NSInteger btnIndex))aBlock;
-(void) handlerShouldEnableFirstOtherButton:(BOOL (^)(void))aBlock;

.m文件

#undef	UIAlertView_key_clicked
#define UIAlertView_key_clicked	"UIAlertView.clicked"
#undef	UIAlertView_key_cancel
#define UIAlertView_key_cancel	"UIAlertView.cancel"
#undef	UIAlertView_key_willPresent
#define UIAlertView_key_willPresent	"UIAlertView.willPresent"
#undef	UIAlertView_key_didPresent
#define UIAlertView_key_didPresent	"UIAlertView.didPresent"
#undef	UIAlertView_key_willDismiss
#define UIAlertView_key_willDismiss	"UIAlertView.willDismiss"
#undef	UIAlertView_key_didDismiss
#define UIAlertView_key_didDismiss	"UIAlertView.didDismiss"
#undef	UIAlertView_key_shouldEnableFirstOtherButton
#define UIAlertView_key_shouldEnableFirstOtherButton	"UIAlertView.SEFOB"

-(void) handlerClickedButton:(void (^)(NSInteger btnIndex))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_clicked, aBlock, OBJC_ASSOCIATION_COPY);
}
-(void) handlerCancel:(void (^)(void))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_willPresent, aBlock, OBJC_ASSOCIATION_COPY);
}
-(void) handlerWillPresent:(void (^)(void))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_cancel, aBlock, OBJC_ASSOCIATION_COPY);
}

-(void) handlerDidPresent:(void (^)(void))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_didPresent, aBlock, OBJC_ASSOCIATION_COPY);
}
-(void) handlerWillDismiss:(void (^)(NSInteger btnIndex))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_willDismiss, aBlock, OBJC_ASSOCIATION_COPY);
}
-(void) handlerDidDismiss:(void (^)(NSInteger btnIndex))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_didDismiss, aBlock, OBJC_ASSOCIATION_COPY);
}
-(void) handlerShouldEnableFirstOtherButton:(BOOL (^)(void))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIAlertView_key_shouldEnableFirstOtherButton, aBlock, OBJC_ASSOCIATION_COPY);
}

#pragma mark - UIAlertViewDelegate
-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    void (^block)(NSInteger btnIndex) = objc_getAssociatedObject(self, UIAlertView_key_clicked);
    
    if (block) block(buttonIndex);
}
-(void) alertViewCancel:(UIAlertView *)alertView{
    void (^block)(void) = objc_getAssociatedObject(self, UIAlertView_key_cancel);
    
    if (block) block();
}
-(void) willPresentAlertView:(UIAlertView *)alertView{
    void (^block)(void) = objc_getAssociatedObject(self, UIAlertView_key_willPresent);
    
    if (block) block();
}

-(void) didPresentAlertView:(UIAlertView *)alertView{
    void (^block)(void) = objc_getAssociatedObject(self, UIAlertView_key_didPresent);
    
    if (block) block();
}

-(void) alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{
    void (^block)(NSInteger btnIndex) = objc_getAssociatedObject(self, UIAlertView_key_willPresent);
    
    if (block) block(buttonIndex);
}

-(void) alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
    void (^block)(NSInteger btnIndex) = objc_getAssociatedObject(self, UIAlertView_key_didPresent);
    
    if (block) block(buttonIndex);
}


-(BOOL) alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView{
    BOOL (^block)(void) = objc_getAssociatedObject(self, UIAlertView_key_shouldEnableFirstOtherButton);
    
    if (block) {
        return block();
    }
    return YES;
}