iOS UIButton与UITextAlignmentLeft仍然居中文本？

Question

问题:
一个按钮的设置后titleEdgeInset和UITextAlignmentLeft按钮的标题仍然是中心,不是以左对齐.

细节:
我有一个200px宽的按钮,使用自定义背景,左侧是图像.由于我不希望按钮标题覆盖图像,我使用了标题titleEdgeInset=UIEdgeInsetsMake(0.0, 45.0, 0.0, 0.0);.这应该使标题标签的x位置从45px开始并以200px结束.我还希望按钮的标题与图像左对齐,所以我也设置了textAlignment = UITextAlignmentLeft.但是,标题文本仍然在45px和200px之间居中,而不是左对齐.

为什么？

这是相关的代码:

button.titleEdgeInsets = UIEdgeInsetsMake(0.0, 45.0, 0.0, 0.0);
button.titleLabel.textAlignment = UITextAlignmentLeft;
[button setTitle:@"X"];

Answer 1

我的测试代码:

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(20, 20, 200, 72);
UIImage *image = [UIImage imageNamed:@"rob.png"];
[button setImage:image forState:UIControlStateNormal];
button.imageEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
[button setTitle:@"Hello" forState:UIControlStateNormal];
button.titleEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[self.view addSubview:button];

请注意,我button.contentHorizontalAlignment没有设置button.titleLabel.textAlignment.我的结果:

Answer 2

为按钮设置contentHorizo​​ntalAlignment属性,它将起作用.

YourButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

Swift 4.0

YourButton.contentHorizontalAlignment = UIControlContentHorizontalAlignment.center