Question

我正在根据下面提到的代码块以编程方式创建UIButton。我需要为按钮的文本指定RGB颜色。它不适用。有什么特别的原因吗？

  CGRect buttonFrame = CGRectMake(353, y, 607, 30);
    UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];
    button.tag = event.eventId;
    [button setTitle:event.eventName forState: UIControlStateNormal];
     button.titleLabel.font=[UIFont fontWithName:@"arial" size:14];
    [button addTarget:self action:@selector(btnSelected:) forControlEvents:UIControlEventTouchUpInside];

    [button setTitleColor:[UIColor colorWithRed:10.0 green:20.0 blue:100.0 alpha:1.0] forState: UIControlEventAllEvents];
    [self.contentView addSubview:button];

由于

Answer 1

RGB值必须在0.0到1.0的范围内。将每个数字除以255.0。

Answer 2

这是你的理由：

写

    [button setTitleColor:[UIColor colorWithRed:10.0/255.0 green:20.0/255.0 blue:100.0/255.0 alpha:1.0] forState: UIControlEventAllEvents];

而不是只是

[button setTitleColor:[UIColor colorWithRed:10.0 green:20.0 blue:100.0 alpha:1.0] forState: UIControlEventAllEvents];

享受编程..

Answer 3

// no need to alloc UIButton.. 

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(353, y, 607, 30);
button.tag = event.eventId;
[button setTitle:event.eventName forState: UIControlStateNormal];
 button.titleLabel.font=[UIFont fontWithName:@"arial" size:14];
[button addTarget:self action:@selector(btnSelected:) forControlEvents:UIControlEventTouchUpInside];

[button setTitleColor:[UIColor colorWithRed:10.0/255.0 green:20.0/255.0 blue:100.0/255.0 alpha:1.0] forState:UIControlStateNormal];
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];

[self.contentView addSubview:button];

Answer 4

根据Apple Documentation，颜色值的范围为0.0到1.0，因此您应该将当前值除以其最大可能值（通常为255），如下所示：

[button setTitleColor:[UIColor colorWithRed:10.0/255.0 green:20.0/255.0 blue:100.0/255.0 alpha:1.0] forState: UIControlEventAllEvents];

UIButton文本颜色与RGB

4 个答案: