Objective-C学习之Appearance

最新推荐文章于 2022-08-15 15:07:05 发布

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最新推荐文章于 2022-08-15 15:07:05 发布

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分类专栏： iOS学习--从入门到实战 Objective-C学习文章标签： ios Appearance

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本文介绍了Objective-C中的Appearance Proxies，这是一个让UIView及其子类可以统一设置外观的协议。通过UIAppearance，我们可以便捷地设定某类控件在整个应用中的特定属性，如将所有UIButton的titleColor统一设置为灰色。更多详情可参阅原文链接。

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Appearance Proxies

UIAppearance是一个协议，UIView默认已经遵守了这个协议。

@protocol UIAppearance <NSObject>

@interface UIView : UIResponder <NSCoding, UIAppearance, UIAppearanceContainer, UIDynamicItem, UITraitEnvironment, UICoordinateSpace, UIFocusEnvironment>

来看看UIAppearance都有什么方法

+ (instancetype)appearance;
+ (instancetype)appearanceWhenContainedIn:(nullable Class <UIAppearanceContainer>)ContainerClass, ... NS_REQUIRES_NIL_TERMINATION NS_DEPRECATED_IOS(5_0, 9_0, "Use +appearanceWhenContainedInInstancesOfClasses: instead") __TVOS_PROHIBITED;
+ (instancetype)appearanceWhenContainedInInstancesOfClasses:(NSArray<Class <UIAppearanceContainer>> *)containerTypes NS_AVAILABLE_IOS(9_0);
+ (instancetype)appearanceForTraitCollection:(UITraitCollection *)trait NS_AVAILABLE_IOS(8_0);
+ (instancetype)appearanceForTraitCollection:(UITraitCollection *)trait whenContainedIn:(nullable Class <UIAppearanceContainer>)ContainerClass, ... NS_REQUIRES_NIL_TERMINATION NS_DEPRECATED_IOS(8_0, 9_0, "Use +appearanceForTraitCollection:whenContainedInInstancesOfClasses: instead") __TVOS_PROHIBITED;
+ (instancetype)appearanceForTraitCollection:(UITraitCollection *)trait whenContainedInInstancesOfClasses:(NSArray<Class <UIAppearanceContainer>> *)containerTypes  NS_AVAILABLE_IOS(9_0);

让某一类控件同时表现某种属性

[[UIButton appearance] setBackgroundColor:[UIColor blackColor]];
[[UIButton appearance] setTitle:@"呵呵哒" forState:UIControlStateNormal];

让某一类控件在另一种控件中同时变现某种属性

[[UIButton appearanceWhenContainedInInstancesOfClasses:@[[UIView class]]] setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];

上面这句话的意思就是—-使UIView上面的UIButton的titleColor都变成灰色

原文链接：http://www.jianshu.com/p/1e4745f0f163