按钮防多点全局更改

解决思路：创建一个UIButton分类，运用runtime机制修改sendAction:to:forEvent:方法

@interface UIButton (AvoidMutiTouch)

@property (nonatomic, assign) NSTimeInterval uxy_acceptEventTime;

@property (nonatomic,assign) BOOL uxy_ignoreEvent;//是否可以多点

@end

#define  kUxy_acceptEventInterval 1 //在多少时间范围内可接受下次点击

@implementation UIButton (AvoidMutiTouch)

static const char *UIControl_acceptedEventTime = "UIControl_acceptedEventTime";

static const char *UIControl_ignoreEvent = "UIControl_ignoreEvent";

- (NSTimeInterval)uxy_acceptEventTime

{

return [objc_getAssociatedObject(self, UIControl_acceptedEventTime) doubleValue];

}

- (void)setUxy_acceptEventTime:(NSTimeInterval)uxy_acceptEventTime

{

objc_setAssociatedObject(self, UIControl_acceptedEventTime, @(uxy_acceptEventTime), OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

- (BOOL)uxy_ignoreEvent

{

return [objc_getAssociatedObject(self, UIControl_ignoreEvent) boolValue];

}

- (void)setUxy_ignoreEvent:(BOOL)uxy_ignoreEvent

{

objc_setAssociatedObject(self, UIControl_ignoreEvent, @(uxy_ignoreEvent), OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

+ (void)load

{

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

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

SEL selB = @selector(uxySendAction:to:forEvent:);

Method methodA =  class_getInstanceMethod(self,selA);

Method methodB = class_getInstanceMethod(self, selB);

BOOL isAdd = class_addMethod(self, selA, method_getImplementation(methodB), method_getTypeEncoding(methodB));

if (isAdd) {

class_replaceMethod(self, selB, method_getImplementation(methodA), method_getTypeEncoding(methodA));

}else{

method_exchangeImplementations(methodA, methodB);

}

});

}

- (void)uxySendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event

{

if ([NSStringFromClass(self.class) isEqualToString:@"UIButton"]) {

if(self.uxy_ignoreEvent){

[self uxySendAction:action to:target forEvent:event];

return;

}

if ([NSDate date].timeIntervalSince1970 - self.uxy_acceptEventTime < kUxy_acceptEventInterval) {

return;

}

if (kUxy_acceptEventInterval > 0) {

self.uxy_acceptEventTime = [NSDate date].timeIntervalSince1970;

}

}

[self uxySendAction:action to:target forEvent:event];

}

@end