UIEdgeInsets不工作

Question

我希望按钮文本出现在x维度的按钮中间附近。然而，按钮文本仍然保留在视图的最左边，就好像x是0一样。我已经向setTitleEdgeInsets和setContentHorizontalAlignment确认了。我还尝试设置contentEdgeInsets而不是titleEdgeInsets。我错过了什么？

UIButton *row = [[UIButton alloc] initWithFrame:
                 CGRectMake(0, index * kRowHeight, 320, kRowHeight)];
[row setTitle:value forState:UIControlStateNormal];
[row setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
[row setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
[row setTitleEdgeInsets:UIEdgeInsetsMake(180.0, 20.0, 0, 0)];
[self.view addSubview:row];

Answer 1

我的参数排序不正确。

UIEdgeInsets定义为

typedef struct {
   CGFloat top, left, bottom, right;
} UIEdgeInsets;

Answer 2

该按钮具有titleLabel属性。更改文本对齐方式。

Answer 3

你有没有尝试过edgeInsets 20 20 20？