iOS之使用Runtime解決UIButton多次點擊(重複點擊)

在實際開發中我們，點擊一個button按鍵時，需要觸發一個事件去執行。使用者在正常操作情況下，單次點擊時，button只會響應一次點擊。但是如果使用者多次點擊一個button，那麼就會引起這個事件被多次執行，導致一些bug的出現。
如何優雅解決的這個問題呢。今天我們來使用Runtime來解決UIButton重複點擊的問題。
　首先建立一個分類category，繼承於UIControl,名字自己定義。
　UIControl+ZHW.h(.h檔案)

@interface UIControl (ZHW)@property (nonatomic, assign) NSTimeInterval zhw_acceptEventInterval;//添加點擊事件的間隔時間@property (nonatomic, assign) BOOL zhw_ignoreEvent;//是否忽略點擊事件,不響應點擊事件@end

UIControl+ZHW.m(.m檔案)在使用runtime時，需要匯入相應的庫（objc/runtime.h）

@implementation UIControl (ZHW)static const char *UIControl_acceptEventInterval = "UIControl_acceptEventInterval";static const char *UIcontrol_ignoreEvent = "UIcontrol_ignoreEvent";- (NSTimeInterval)zhw_acceptEventInterval {    return [objc_getAssociatedObject(self, UIControl_acceptEventInterval) doubleValue];}- (void)setZhw_acceptEventInterval:(NSTimeInterval)zhw_acceptEventInterval {    objc_setAssociatedObject(self, UIControl_acceptEventInterval, @(zhw_acceptEventInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (BOOL)zhw_ignoreEvent {    return [objc_getAssociatedObject(self, UIcontrol_ignoreEvent) boolValue];}- (void)setZhw_ignoreEvent:(BOOL)zhw_ignoreEvent {    objc_setAssociatedObject(self, UIcontrol_ignoreEvent, @(zhw_ignoreEvent), OBJC_ASSOCIATION_RETAIN_NONATOMIC);}+ (void)load {    Method a = class_getInstanceMethod(self, @selector(sendAction:to:forEvent:));    Method b = class_getInstanceMethod(self, @selector(__zhw_sendAction:to:forEvent:));    method_exchangeImplementations(a, b);}- (void)__zhw_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event {    if (self.zhw_ignoreEvent) return;    if (self.zhw_acceptEventInterval > 0) {        self.zhw_ignoreEvent = YES;        [self performSelector:@selector(setZhw_ignoreEvent:) withObject:@(NO) afterDelay:self.zhw_acceptEventInterval];    }    [self __zhw_sendAction:action to:target forEvent:event];}@end

　在需要用到地方匯入UIControl+ZHW.h標頭檔設定button的點擊時間間隔

@interface ViewController ()@property (weak, nonatomic) IBOutlet UIButton *button;@property (weak, nonatomic) IBOutlet UIView *colorView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.button.zhw_ignoreEvent = NO;    self.button.zhw_acceptEventInterval = 3.0;}- (IBAction)runtimeAction:(UIButton *)sender {    NSLog(@"----run click");    [UIView animateWithDuration:3 animations:^{        self.colorView.center = CGPointMake(200, 500);    } completion:^(BOOL finished) {        self.colorView.center = CGPointMake(95, 85);    }];}- (IBAction)buttonAction:(UIButton *)sender {    NSLog(@"------comm click");    [UIView animateWithDuration:3 animations:^{        self.colorView.center = CGPointMake(200, 500);    } completion:^(BOOL finished) {        self.colorView.center = CGPointMake(95, 85);    }];}

　運行demo,可以發現button多次點擊的問題得到瞭解決。在設定button的相應點擊事件的時間間隔，在這個 間隔時間內，button只會響應一次點擊事件。
　
附上demo：UIButtonMutablieClick