objective-c - 如何更改 Iphone sdk 中 UIButton 标题的 alpha 值？

我需要更改 UIButton 的 alpha 值，任何人都可以建议我如何处理它。

我编写的按钮代码为:

UIView* buttonView = [[UIView alloc] initWithFrame:CGRectMake(10, 0, 100, 40)];
    buttonView.backgroundColor = [UIColor clearColor];

    backButton = [[UIButton alloc] initWithFrame:CGRectMake(5, 5, 100, 30)];
    [backButton setBackgroundImage:[UIImage imageNamed:@"backbutton_100.png"] forState:UIControlStateNormal];
    [backButton addTarget:self  action:@selector(backAction:)  forControlEvents:UIControlEventTouchUpInside];
    [backButton setTitle:@"  All Customers" forState:UIControlStateNormal];
    backButton.titleLabel.font = [UIFont boldSystemFontOfSize:12];
    [buttonView addSubview:backButton];

    UIBarButtonItem* leftButton = [[UIBarButtonItem alloc] initWithCustomView:buttonView];
    self.navigationItem.leftBarButtonItem = leftButton;
    [leftButton release];

提前致谢。
满满的。

最佳答案

[backButton setTitleColor:[UIColor colorWithRed:0.3 green:0.6 blue:0.9 alpha:0.5]
//                                set 'alpha' to something less than 1. -----^^^
                 forState:UIControlStateNormal];

关于objective-c - 如何更改 Iphone sdk 中 UIButton 标题的 alpha 值？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/3171831/