iOS小技能： 限制按钮的点击频率(Target-Action设计模式的运用)

/**
 控制接口的请求标志
 */
@property (assign, nonatomic) BOOL IsreqingGetCurrentSysUser;

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

        UITapGestureRecognizer *cutTap = [[UITapGestureRecognizer alloc] init];
        [[cutTap rac_gestureSignal] subscribeNext:^(id x) {
            
            
            NSLog(@" cutTap 点击了 ");
            
            if ( self.models.block) {
                self.models.block(self.models);
            }
            
            
        }];
        [self addGestureRecognizer:cutTap];

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

#import <UIKit/UIKit.h>

#define defaultInterval .2  //默认时间间隔
@interface UIButton (touch)
/**设置点击时间间隔*/
@property (nonatomic, assign) NSTimeInterval timeInterval;
@end

#import "UIButton+touch.h"
#import <objc/runtime.h>
@interface UIButton()
/**bool 类型 YES 不允许点击   NO 允许点击   设置是否执行点UI方法*/
@property (nonatomic, assign) BOOL isIgnoreEvent;
@end
@implementation UIButton (touch)
+ (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);
        }
    });
}
- (NSTimeInterval)timeInterval
{
    return [objc_getAssociatedObject(self, _cmd) doubleValue];
}
- (void)setTimeInterval:(NSTimeInterval)timeInterval
{
    objc_setAssociatedObject(self, @selector(timeInterval), @(timeInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    
}
//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 ([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];
}
//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];
}
@end

//一根或者多根手指离开view，系统会自动调用view的下面方法
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;