Upputton的titleLabel.text未显示在Cocoa Touch上

Question

在运行时创建新的UIButton并设置其titleLabel的文本后,仍然不显示按钮的文本.

我究竟做错了什么？

-(IBAction) cloneMe: (id) sender{

    if (!currentY) {
        currentY = [sender frame].origin.y;
    }

    UIButton *clone = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    CGRect cloneFrame = [sender frame];
    cloneFrame.origin.y += currentY + cloneFrame.size.height + 30;
    clone.frame = cloneFrame;
    [clone titleLabel].text = @"I'm a clone";

    [[sender superview] addSubview:clone];

    currentY = cloneFrame.origin.y + cloneFrame.size.height;


}

Answer 1

你需要:

[clone setTitle:@"I'm a clone" forState:UIControlStateNormal];

查看UIControlAPI文档以获取forState:参数的其他有效值.