ios - UIEdgeInsets 不工作

Question

我希望按钮文本出现在按钮中间附近的 x 维度上。但是按钮文本仍然保留在 View 的最左侧，就好像 x 是 0 一样。我已确保 setTitleEdgeInsets 和 setContentHorizo​​ntalAlignment。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

我对参数的排序不正确。

UIEdgeInsets 定义为

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