UIButton文本顏色與RGB

Question

我正在創建一個UIButton根據下面提到的代碼塊編程。我需要將RGB顏色分配給按鈕的文本。它不適用。任何特定的原因？

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]; 

感謝

Answer 1

這裏是你的原因：

寫

[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];

Enjoy Programming ..

Answer 2

RGB值需要在0.0到1.0的範圍內。將每個數字除以255.0。

Answer 3

根據Apple Documentation顏色值的範圍從0.0到1.0，所以應該用它們的最大可能的值通常255像這樣將當前值：

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

Answer 4

// 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];