開啟一個需要傳遞參數(shù)的定時器

先上代碼

- (void)creatTimer{
  //  id userInfo = @"貴哥jk";
  //  id userInfo = @{@"姓名": @"貴哥jk", @"email":@"942513675@qq.com"};
  //  id userInfo = @10;
    
    id userInfo = [UIButton new];
    ((UIButton *)userInfo).tag = 1000;
    
    NSTimeInterval time = 0.5;
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:time target:self selector:@selector(timerSelector:) userInfo:userInfo repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}
- (void)timerSelector:(NSTimer *)timer{
    id userInfo = timer.userInfo;
    NSLog(@"%@",userInfo);

    UIButton *btn = userInfo;
    NSLog(@"%ld",btn.tag);

    if (@"條件判斷") {
        [timer invalidate];
        timer = nil;
    }
}

解析

• 類方法:scheduledTimerWithTimeInterval:(NSTimeInterval) time target:(id) aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;可以傳遞一個 id 類型的參數(shù)
• 在傳遞參數(shù)的時候是以 NSTimer 的實例對象的 userInfo 屬性傳遞的
• 注意在 timerSelector: 方法中將 userInfo 轉(zhuǎn)化為傳遞的類型就可以了