UISegmentedControl setTitleTextAttributes不工作

Question

因此，我尝试更改我的UISegmentedControl的标题的文本属性，但它不起作用，什么也没改变。我还应用了一个自定义的背景和分隔符，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

您使用了错误的键和值顺序，因此它无法工作。

尝尝这个

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor blackColor],UITextAttributeTextColor,
                                                         [UIColor clearColor], UITextAttributeTextShadowColor,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], UITextAttributeFont, nil] forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [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:@"HelveticaNeue-Bold" size:16.0], UITextAttributeFont, nil] forState:UIControlStateSelected];

Answer 2

注意工厂方法(value / key)之间的排序方式的差异

[NSDictionary dictionaryWithObjectsAndKeys: value, key, nil]

和文字声明(键/值)

@{key: value}

您只是使用了错误的键和值的顺序。

这将会起作用：

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


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

Answer 3

请注意，从iOS 7开始，这些键中的一些现在已被弃用。您现在需要使用类似以下内容：

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor blackColor], NSForegroundColorAttributeName,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], NSFontAttributeName, nil] forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor colorWithRed: 135.0/255.0 green: 135.0/255.0 blue: 135.0/255.0 alpha: 1.0],NSForegroundColorAttributeName,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], NSFontAttributeName, nil] forState:UIControlStateSelected];