ios - UISegmentedControl setTitleTextAttributes 不起作用

Question

所以我尝试更改我的 UISegmentedControl 标题的文本属性，但它不起作用，没有任何变化。我还应用了自定义背景和分隔线，它可以正常工作，但不是这个。

NSDictionary *normaltextAttr = 
            @{[UIColor blackColor]: UITextAttributeTextColor,
              [UIColor  clearColor]: UITextAttributeTextShadowColor,
              [UIFont fontWithName:_regularFont size:20.f]: UITextAttributeFont};


NSDictionary *selectedtextAttr = 
            @{[UIColor colorWithRed:135.0/255.0 green:135.0/255.0 blue:135.0/255.0 alpha:1.0]: UITextAttributeTextColor,
              [UIColor clearColor]: UITextAttributeTextShadowColor,
              [NSValue valueWithUIOffset:UIOffsetMake(0, 1)]: UITextAttributeTextShadowOffset,
              [UIFont fontWithName:_regularFont size:0.0]: UITextAttributeFont};

[[UISegmentedControl appearance] setTitleTextAttributes:normaltextAttr 
                                               forState:UIControlStateNormal];
[[UISegmentedControl appearance] setTitleTextAttributes:selectedtextAttr 
                                               forState:UIControlStateSelected];

Answer 1

请注意工厂方法(值/键)之间排序方式的差异

[NSDictionary dictionaryWithObjectsAndKeys: value, key, nil]

和文字声明(key/value)

@{key: value}

您只是使用了错误的键和值顺序。

这将起作用:

NSDictionary *normaltextAttr = 
       @{UITextAttributeTextColor : [UIColor blackColor],
         UITextAttributeTextShadowColor : [UIColor  clearColor],
         UITextAttributeFont : [UIFont fontWithName:_regularFont size:20.f]};


[[UISegmentedControl appearance] setTitleTextAttributes:normaltextAttr forState:UIControlStateNormal];