防止暴力点击

一、.使用runtime解决

创建按钮的分类

.声明文件（.h）

#define defaultInterval .5//默认时间间隔

@interface UIButton (UIbutton_Delay)

@property(nonatomic,assign)NSTimeInterval timeInterval;//用这个给重复点击加间隔

@property(nonatomic,assign)BOOL isIgnoreEvent;//YES不允许点击NO允许点击

@end

.实现文件（.m）

#import <objc/runtime.h>

@implementation UIButton (UIbutton_Delay)

- (NSTimeInterval)timeInterval{

    return[objc_getAssociatedObject(self,_cmd)doubleValue];

}

- (void)setTimeInterval:(NSTimeInterval)timeInterval{

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

}

//runtime动态绑定属性

- (void)setIsIgnoreEvent:(BOOL)isIgnoreEvent{

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

}

- (BOOL)isIgnoreEvent{

    return[objc_getAssociatedObject(self,_cmd)boolValue];

}

- (void)resetState{

    [self setIsIgnoreEvent:NO];

}

+ (void)load{

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        SEL selA =@selector(sendAction:to:forEvent:);

        SEL selB =@selector(mySendAction:to:forEvent:);

        Method methodA =class_getInstanceMethod(self, selA);

        Method methodB =class_getInstanceMethod(self, selB);

        //将methodB的实现添加到系统方法中也就是说将methodA方法指针添加成方法methodB的返回值表示是否添加成功

        BOOL isAdd =class_addMethod(self, selA,method_getImplementation(methodB),method_getTypeEncoding(methodB));

        //添加成功了说明本类中不存在methodB所以此时必须将方法b的实现指针换成方法A的，否则b方法将没有实现。

        if(isAdd) {

            class_replaceMethod(self, selB,method_getImplementation(methodA),method_getTypeEncoding(methodA));

        }else{

            //添加失败了说明本类中有methodB的实现，此时只需要将methodA和methodB的IMP互换一下即可。

            method_exchangeImplementations(methodA, methodB);

        }

    });

}

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

    if([NSStringFromClass(self.class)isEqualToString:@"UIButton"]) {

        self.timeInterval=self.timeInterval==0?defaultInterval:self.timeInterval;

        if(self.isIgnoreEvent){

            return;

        }else if(self.timeInterval>0){

            [self performSelector:@selector(resetState) withObject:nil afterDelay:self.timeInterval];

        }

    }

    //此处methodA和methodB方法IMP互换了，实际上执行sendAction；所以不会死循环

    self.isIgnoreEvent=YES;

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

}

二、使用按钮的enable属性解决

三、每次在点击时先取消之前的操作

[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(buttonClicked:) object:sender];

[sel fperformSelector:@selector(buttonClicked: )withObject:sender afterDelay:0.2f];