UIButton狂点问题

#import <UIKit/UIKit.h>
#define defaultInterval 0.25//默认时间间隔
@interface UIButton (Countdown)
@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

#import "UIButton+Countdown.h"
#import <objc/runtime.h>
@implementation UIButton (Countdown)
-(BOOL)isTouchInside
{
    //    self.enabled = NO;
    //    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    //        self.enabled = YES;
    //    });
//    funclog
    return YES;
}
- (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{
    //注意BOOL类型需要用OBJC_ASSOCIATION_RETAIN_NONATOMIC不要用错，否则set方法会赋值出错
    objc_setAssociatedObject(self,@selector(isIgnoreEvent),@(isIgnoreEvent),OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)isIgnoreEvent{
    //_cmd == @select(isIgnore);和set方法里一致
    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);
        }
    });
}
//当我们按钮点击事件sendAction时将会执行mySendAction
- (void)mySendAction:(SEL)action to:(id)target forEvent:(UIEvent*)event
{
    if([self isKindOfClass:[UIButton class]]) {
        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];
}