Question

我想设置按钮的新背景颜色，其中'tag'等于在Timer动作中生成的随机数。

在我的VIEWDidLoad中：

UIButton *firstButton = [[UIButton alloc] init];
    firstButton.frame = CGRectMake(0, 0, fullwidth/2, fullwidth/2);
    firstButton.backgroundColor = UIColorFromRGB(0x95A5A6);
    [firstButton viewWithTag:1];
    [self.view addSubview:firstButton];

UIButton *secondButton = [[UIButton alloc] init];
secondButton.frame = CGRectMake(fullwidth/2, 0, fullwidth/2, fullwidth/2);
secondButton.backgroundColor = UIColorFromRGB(0x95A5A6);
[secondButton viewWithTag:2];
[self.view addSubview:secondButton];

UIButton *thirdButton = [[UIButton alloc] init];
thirdButton.frame = CGRectMake(0, fullwidth/2, fullwidth/2, fullwidth/2);
thirdButton.backgroundColor = UIColorFromRGB(0x95A5A6);
[thirdButton viewWithTag:3];
[self.view addSubview:thirdButton];

UIButton *fourthButton = [[UIButton alloc] init];
fourthButton.frame = CGRectMake(fullwidth/2, fullwidth/2, fullwidth/2, fullwidth/2);
fourthButton.backgroundColor = UIColorFromRGB(0x95A5A6);
[fourthButton viewWithTag:4];
[self.view addSubview:fourthButton];

timer = [NSTimer timerWithTimeInterval:0.1f target:self selector:@selector(timerOUT:) userInfo:nil repeats:YES];
NSLog(@"TIMER: %@", timer);
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

我的计时器动作：

 -(void)timerOUT:(NSTimer*)sender
{
    int lowerBound = 1;
    int upperBound = 5;
    int rndValue = lowerBound + arc4random() % (upperBound - lowerBound);

    UIButton *lightUpButton = (UIButton*)[firstLevelView viewWithTag:rndValue];
    lightUpButton.backgroundColor = UIColorFromRGB(0x1ABC9C);
}

Answer 1

设置按钮的标签，如下所示： -

[btn settag:1];

并在您的计时器中检查rndValue然后使用开关案例或if else更改按钮的颜色。如： -

if(rndValue==1)
{
// change the color of first button
}

Xcode：UIButton设置背景颜色WHERE标记相等

1 个答案: