//// UIButton+touch.h
// LiqForDoctors
#import#define defaultInterval .5 //默認(rèn)時(shí)間間隔

@interface UIButton (touch)

/**設(shè)置點(diǎn)擊時(shí)間間隔*/

@property (nonatomic, assign) NSTimeInterval timeInterval;

@end

//
// UIButton+touch.m
// LiqForDoctors
//

#import "UIButton+touch.h"
@interface UIButton()
/**bool 類型 YES 不允許點(diǎn)擊 NO 允許點(diǎn)擊 設(shè)置是否執(zhí)行點(diǎn)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);
  //將 methodB的實(shí)現(xiàn) 添加到系統(tǒng)方法中 也就是說 將 methodA方法指針添加成 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 說明 本類中不存在methodB 所以此時(shí)必須將方法b的實(shí)現(xiàn)指針換成方法A的，否則 b方法將沒有實(shí)現(xiàn)。
  if (isAdd) {
   class_replaceMethod(self, selB, method_getImplementation(methodA), method_getTypeEncoding(methodA));
  }else{
   //添加失敗了 說明本類中 有methodB的實(shí)現(xiàn)，此時(shí)只需要將 methodA和methodB的IMP互換一下即可。
   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);

}
//當(dāng)我們按鈕點(diǎn)擊事件 sendAction 時(shí) 將會(huì)執(zhí)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];
  }
 }
 //此處 methodA和methodB方法IMP互換了，實(shí)際上執(zhí)行 sendAction；所以不會(huì)死循環(huán)
 self.isIgnoreEvent = YES;
 [self mySendAction:action to:target forEvent:event];
}
//runtime 動(dòng)態(tài)綁定 屬性
- (void)setIsIgnoreEvent:(BOOL)isIgnoreEvent{
 // 注意BOOL類型 需要用OBJC_ASSOCIATION_RETAIN_NONATOMIC 不要用錯(cuò)，否則set方法會(huì)賦值出錯(cuò)
 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