UIButton小技巧----点击事件时间间隔

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UIButton小技巧—-点击事件时间间隔

起因

      在开发过程中对于UIbutton的点击事件，如果进行频繁的点击，可能会造成事件的不必要的重复执行事件，甚至造成不必要的错误。

解决方案

     通过添加Category，重写sendAction:to:forEvent:方法。(通过runtime交换系统的sendAction:to:forEvent: 和 自定义的customSendAction:to:forEvent:方法，在定义方法中进行时间判断是否符合时间间隔需求，不符合直接return否则在调用系统的sendAction:to:forEvent:)。

代码

#import <UIKit/UIKit.h>@interface UIButton (TimeInterval)@property NSTimeInterval repeatEventInterval;@end

#import "UIButton+TimeInterval.h"
#import <objc/runtime.h>const char *repeatEventIntervalKey  = "repeatEventIntervalKey";
const char *previousClickTimeKey = "previousClickTimeKey";@implementation UIButton (TimeInterval)+ (void)load {Method sendAction = class_getInstanceMethod([self class], @selector(sendAction:to:forEvent:));Method customSendAction = class_getInstanceMethod([self class], @selector(customSendAction:to:forEvent:));method_exchangeImplementations(sendAction, customSendAction);
}- (void)sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event {[super sendAction:action to:target forEvent:event];
}- (void)setRepeatEventInterval:(NSTimeInterval)repeatEventInterval {objc_setAssociatedObject(self, repeatEventIntervalKey, @(repeatEventInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}- (NSTimeInterval)repeatEventInterval {return (NSTimeInterval)[objc_getAssociatedObject(self, repeatEventIntervalKey) doubleValue];
}- (void)setPreviousClickTime:(NSTimeInterval)previousClickTime {objc_setAssociatedObject(self, previousClickTimeKey, @(previousClickTime), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}- (NSTimeInterval)previousClickTime {return [objc_getAssociatedObject(self, previousClickTimeKey) doubleValue];
}- (void)customSendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event {if ( NSDate.date.timeIntervalSince1970 - self.previousClickTime < self.repeatEventInterval ) {return;}if (self.repeatEventInterval > 0) {self.previousClickTime = NSDate.date.timeIntervalSince1970 ;}[self customSendAction:action to:target forEvent:event];
}@end

应用

#import "UIButton+TimeInterval.h"button.repeatEventInterval = 2;

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