学步园

block是个好语法, 可偏偏 IOS 原生的UIAlertView UIActionSheet不支持block,本文将给上述个类添加block的支持,

.h文件

-(void) handlerClickedButton:(void (^)(NSInteger btnIndex))aBlock;

.m文件

-(void) handlerClickedButton:(void (^)(NSInteger btnIndex))aBlock{
    self.delegate = self;
    objc_setAssociatedObject(self, UIActionSheet_key_clicked, aBlock, OBJC_ASSOCIATION_COPY);
}

-(void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    void (^block)(NSInteger btnIndex) = objc_getAssociatedObject(self, UIActionSheet_key_clicked);
    
    if (block) block(buttonIndex);
}

按照这种思路将UIAlertView,UIActionSheet 委托全部重写一遍

@interface UIAlertView (Block)

-(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;

@end

@interface UIActionSheet (Block)

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

@end

调用的时候

    UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:@"title" message:@"msg" delegate:nil cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil] autorelease];
    [alertView handlerClickedButton:^(NSInteger btnIndex) {
        NSLogD(@"%d", btnIndex);
    }];
    [alertView show];

其实真这样全部改造下了发先也没简化多少,ui的代码和业务逻辑的代码混在一起了,反而代码更加混乱.

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