防止按鈕被重復點擊這里提供3種方法：
第一種：先取消之前的操作在執行
-?(void)buttonClicked:(id)sender{
//點擊按鈕后先取消之前的操作，再進行需要進行的操作
[[self class]cancelPreviousPerformRequestsWithTarget:self selector:@selector(buttonClicked:)object:sender];
[self performSelector:@selector(buttonClicked:?)withObject:sender afterDelay:0.2f];
}
第二種：點擊后設為不可點擊，幾秒后恢復狀態
-(void)buttonClicked:(id)sender{
self.button.enabled?= NO;
[self performSelector:@selector(changeButtonStatus)withObject:nil afterDelay:1.0f];//防止重復點擊
}
-(void)changeButtonStatus{
self.button.enabled?=YES;
}
第三種：runtime?
創建繼承UIButton的Category文件
.h文件
#import
#define?defaultInterval.5//默認時間間隔
@interfaceUIControl?(UIControl_buttonCon)
@property(nonatomic,assign)NSTimeIntervaltimeInterval;//用這個給重復點擊加間隔
@property(nonatomic,assign)BOOLisIgnoreEvent;//YES不允許點擊NO允許點擊
@end
.m文件
#import"UIControl+UIControl_buttonCon.h"
@implementationUIControl?(UIControl_buttonCon)
-?(NSTimeInterval)timeInterval{
return[objc_getAssociatedObject(self,_cmd)doubleValue];
}
-?(void)setTimeInterval:(NSTimeInterval)timeInterval{
objc_setAssociatedObject(self,@selector(timeInterval),@(timeInterval),OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
//runtime動態綁定屬性
-?(void)setIsIgnoreEvent:(BOOL)isIgnoreEvent{
objc_setAssociatedObject(self,@selector(isIgnoreEvent),@(isIgnoreEvent),OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-?(BOOL)isIgnoreEvent{
return[objc_getAssociatedObject(self,_cmd)boolValue];
}
-?(void)resetState{
[selfsetIsIgnoreEvent:NO];
}
+?(void)load{
staticdispatch_once_tonceToken;
dispatch_once(&onceToken,?^{
SELselA?=@selector(sendAction:to:forEvent:);
SELselB?=@selector(mySendAction:to:forEvent:);
MethodmethodA?=class_getInstanceMethod(self,?selA);
MethodmethodB?=class_getInstanceMethod(self,?selB);
//將methodB的實現添加到系統方法中也就是說將methodA方法指針添加成方法methodB的返回值表示是否添加成功
BOOLisAdd?=class_addMethod(self,?selA,method_getImplementation(methodB),method_getTypeEncoding(methodB));
//添加成功了說明本類中不存在methodB所以此時必須將方法b的實現指針換成方法A的，否則b方法將沒有實現。
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的實現，此時只需要將methodA和methodB的IMP互換一下即可。
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;
}elseif(self.timeInterval>0){
[selfperformSelector:@selector(resetState)withObject:nilafterDelay:self.timeInterval];
}
}
//此處methodA和methodB方法IMP互換了，實際上執行sendAction；所以不會死循環
self.isIgnoreEvent=YES;
[selfmySendAction:actionto:targetforEvent:event];
}
@end
