用RunTime來防止按鈕被多次點擊

對於這個功能的實現是看了這個兩個連接裏的內容，主要是爲UIButton增加一個延時的屬性。

1、http://www.cocoachina.com/ios/20150911/13260.html

2、http://blog.sina.com.cn/s/blog_60342e330101tcz1.html

我這邊總共做了兩個，一個是創建UIButton的子類來實現，另一個是創建UIButton的cateorgy來實現。

第一個，創建UIButton的子類來實現

@interface MyButton :UIButton

@property (assign,nonatomic)NSTimeInterval timeInterval;

@end

@interface MyButton()

@property (assign,nonatomic)BOOL ignoreEvent;

@end

@implementation MyButton

+(void)load

{

   Method a =class_getInstanceMethod(self,@selector(sendAction:to:forEvent:));

   Method b =class_getInstanceMethod(self,@selector(timer_sendAction:to:forEvent:));

    //是將a方法替換成b方法

    method_exchangeImplementations(a, b);

}

-(void)timer_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event

{

    //如果是YES，規定的延時還沒到

    if (self.ignoreEvent) {

       return;

    }

    

   if (self.timeInterval >0) {

        //先設置這個參數爲YES

       self.ignoreEvent =YES;

        //當指定延時時間到後，再將這個參數設爲NO

        [selfperformSelector:@selector(setIgnoreEvent:)withObject:@(NO)afterDelay:self.timeInterval];

    }

    

    [selftimer_sendAction:actionto:target forEvent:event];

}

在按鈕使用界面

[self.buttonaddTarget:selfaction:@selector(click:)forControlEvents:UIControlEventTouchUpInside];

//設置延時時間，單位秒

self.button.timeInterval =5;

第二個，創建UIButton的cateorgy來實現

由於category不能擴展屬性，所以，必須用objc_setAssociatedObject和objc_getAssociatedObject來設置和關聯屬性

@interface UIButton (ZM)

//設置延時時間

@property (assign,nonatomic)NSTimeInterval timeInterval;

@end

@implementation UIButton (ZM)

@dynamic timeInterval;

//是否可以再次點擊 0代表未被點擊 1代表已被點擊

static BOOL isClick;

+(void)load

{

    Method a = class_getInstanceMethod(self, @selector(sendAction:to:forEvent:));

    Method b = class_getInstanceMethod(self, @selector(timer_sendAction:to:forEvent:));

    method_exchangeImplementations(a, b);

}

-(NSTimeInterval)timeInterval

{

    return [objc_getAssociatedObject(self, @selector(timeInterval)) doubleValue];

}

-(void)setTimeInterval:(NSTimeInterval)timeInterval

{

    //第二個參數key，用@selector是因爲SEL生成的時候就是一個唯一的常量

    objc_setAssociatedObject(self, @selector(timeInterval), @(timeInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

-(void)timer_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event

{

    if (isClick) {

        return;

    }

    

    if (self.timeInterval > 0) {

        isClick = YES;

        

        //當指定延時時間到後，再將這個參數設爲NO

        [self performSelector:@selector(setIsClick:) withObject:@(NO) afterDelay:self.timeInterval];

    }

    

    [self timer_sendAction:action to:target forEvent:event];

}

-(void)setIsClick:(BOOL)flag

{

    isClick = flag;

}

@end