UIAppearance定制控件的默认外观
一,概述
控件的外观，受到tint color，background image， background color等属性的共同影响，通常要修改某个控件对象的外观，就去调用上面属性的相关setter方法（或者其他可以修改它们的方法）就可以了。但是，如果希望整个app中的控件都保持一致的风格，比如所有button的风格（指的是大小，背景图，形状等）都一样，那么一个一个去重复设置每个button的风格，就显得太麻烦了。如果可以给Button类设定一个默认外观，就方便多了。appearance proxy就可以实现。对于导航栏，tabBarController等等管理多个视图控制器的控件，要对它们的全局外观进行修改，通常比较便捷的方法也是定制默认外观，也就是使用appearance proxy。
二,下面就来详细介绍UIAppearance
1>、了解一个概念appearance proxy外观代理
外观代理，它是一个管理可视化类（比如控件）的默认外观的对象。我们可以通过这个类的外观代理，来修改这个类的默认外观（与外观有关的属性的默认值），或者这个类在某种场合下的默认外观。2>、需要遵守两个协议
一个类要能够使用外观代理，需要遵守两个协议，一个是UIAppearance，一个是UIAppearanceContainer协议。1. UIAppearance协议
该协议定义了4个方法，用于获取类的外观代理，分别对应4种外观代理。
2. UIAppearanceContainer协议
该协议定义了一个常量UI_APPEARANCE_SELECTOR，用来标识外观代理可以调用的方法。既然外观代理是用来管理类的默认外观的，那么能够被它调用的方法，或者说它需要调用的方法，往往就是类的某个外观特征的setter和getter方法。也就是说，为一个方法设定UI_APPEARANCE_SELECTOR标签，就表示这个方法可以为外观代理所用。当然，方法的格式是有规定的，基本格式和一般属性的setter和getter方法格式一样，在这个基础上可以增加更多的参数。参数的类型只能是NSInteger或NSUInteger，否则会报错。
注意:UI_APPEARANCE_SELECTOR的标签(如何确定哪些情况下能够通过UIKit的外观代理来定制所有元素（以及元素中的哪些属性）呢？
方法一,查阅文档，
方法二,读头文件。打开对应的UIKit元素的头文件，其中所有带有UI_APPEARANCE_SELECTOR标记的属性都支持通过外观代理来定制。举个例子，UINavigationBar.h中的tintColor属性带有UI_APPEARANCE_SELECTOR标记)
例如:
属性
意味着可以调用
[[UINavigationBar appearance] setbarTintColor:newColor];
方法
3>外观代理的工作时间
官网上简洁的表述：所有通过外观代理对默认外观进行的修改，只会在view layout time 时生效。在此之后，仍可以通过对象的属性和方法来覆盖此默认外观。
我的详细解释：
我们可以随时让外观代理修改默认外观，准确的理解是让外观代理记录好我们对默认外观的定制要求。但是外观代理只会在view layout time时工作一次，也就是让默认外观生效。在此之后，调用外观代理来修改默认外观，是不会即时生效的，换言之，必须要等到下次view layout time的时候才会让这个新定制的默认外观生效。什么时候是view layout time？从运行的效果来看，我暂且理解为加载window（或从其他window返回到本window）的时候，如果有更准确的理解，望赐教。
默认外观对类的所有的对象起作用（所谓默认，就是这个意思）。如果要在默认外观的基础上对某个对象的外观进行修改，就和平常一样，调用这个对象有关外观设置的方法即可。
4>外观代理的获取及使用
下面详细了解UIAppearance协议中定义的4种获取外观代理的方法，及其对应的4种外观代理：1.全局外观代理
功能：代理中的Big Boss，它可以管理控件在任何情况下的默认外观。获取代理的方法：
+ ( instancetype )appearance比如:要获取UINavigationBar的全局外观代理：
UINavigation *appearanceProxy=[UINavigation appearance];
2.只负责指定场合的外观的外观代理
功能：管理控件被包含在指定的类（及其子类）中时的默认外观；管理控件被包含在指定的视图层级关系中时的默认外观。获取代理的方法：
+ (instancetype)appearanceWhenContainedIn:(nullable Class <UIAppearanceContainer>)ContainerClass解释：
这个方法的参数指定了某个类或者多个类。参数个数不定，最后一个参数必须是nil。
例子：
比如，获取作用于“放在UIToolbar类中的UIBarButtonItem对象”的外观代理，这样写：
[UIBarButtonItem appearanceWhenContainedIn: [UIToolbar class],nil];注意：
此时除了放在UIToolbar类中的UIBarButtonItem对象会受这个外观代理管理以外，放在UIToolbar的子类中的UIBarButtonItem对象也会受这个代理管理。
如果要指定层级关系，则传入一个层级关系的对象。
上面说的方法从iOS 5.0开始启用，到iOS 9.0丢弃，iOS 9.0及以后用下面的方法替代:
+(instancetype)appearanceWhenContainedInInstancesOfClasses:(NSArray<Class <UIAppearanceContainer>> *)containerTypes比如，设置导航栏被放在UISplitViewController或者UITabBarController里面时的默认BarTintColor：
[[UINavigationBar appearanceWhenContainedInInstancesOfClasses: @[[UISplitViewController class], [UITabBarController class]]] setBarTintColor:myColor];
3.只负责控件在某种系统环境下的外观的外观代理
功能：管理类在某种系统环境下（比如横屏、竖屏等）的默认外观。系统环境由UITraitCollection对象来指定。(查看UITraitCollection Class Reference）获取代理的方法：
+ (instancetype)appearanceForTraitCollection:(UITraitCollection *)trait
4.只负责控件在某种系统环境、某种场合下的外观的外观代理
功能：管理控件在某种系统环境、某种场合下的默认外观获取代理的方法：
+ (instancetype)appearanceForTraitCollection:(UITraitCollection *)trait whenContainedIn:(Class<UIAppearanceContainer>)ContainerClass以上方法从5.0开始启用，在iOS 9.0被丢弃，iOS 9.0及以后用下面这个方法替代：
+ (instancetype)appearanceForTraitCollection:(UITraitCollection *)trait whenContainedInInstancesOfClasses:(NSArray<Class <UIAppearanceContainer>> *)containerTypes
三,UIKit的外观属性及方法汇总(被标记UI_APPEARANCE_SELECTOR的方法和属性)
UIActivityIndicatorView
@property (readwrite, nonatomic, retain) UIColor *color NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UIBarButtonItem
// 背景图片相关 - (UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state style:(UIBarButtonItemStyle)style barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (UIImage *)backgroundImageForState:(UIControlState)state style:(UIBarButtonItemStyle)style barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (void)setBackgroundVerticalPositionAdjustment:(CGFloat)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (CGFloat)backgroundVerticalPositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setTitlePositionAdjustment:(UIOffset)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIOffset)titlePositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;// 返回键 ：图片、文字
- (void)setBackButtonBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)backButtonBackgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setBackButtonTitlePositionAdjustment:(UIOffset)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIOffset)backButtonTitlePositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setBackButtonBackgroundVerticalPositionAdjustment:(CGFloat)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (CGFloat)backButtonBackgroundVerticalPositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UIBarItem
// 标题富文本
- (void)setTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (NSDictionary *)titleTextAttributesForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UIButton
// 内边缘间距
@property(nonatomic) UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR; // default is UIEdgeInsetsZero// 标题颜色、阴影颜色、背景图片
- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // default if nil. use opaque white - (void)setTitleShadowColor:(UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // default is nil. use 50% black - (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // default is nilUINavigationBar
@property(nonatomic,retain) UIColor *barTintColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // default is nil// 背景图片相关 - 默认是张白色图片
- (void)setBackgroundImage:(UIImage *)backgroundImage forBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; - (UIImage *)backgroundImageForBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; - (void)setBackgroundImage:(UIImage *)backgroundImage forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)backgroundImageForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;// 阴影图片 - 即分割线
@property(nonatomic,retain) UIImage *shadowImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; @property(nonatomic,copy) NSDictionary *titleTextAttributes NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
- (void)setTitleVerticalPositionAdjustment:(CGFloat)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (CGFloat)titleVerticalPositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;//
@property(nonatomic,retain) UIImage *backIndicatorImage NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; @property(nonatomic,retain) UIImage *backIndicatorTransitionMaskImage NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;UIPageControl
// 分页小圆点颜色
@property(nonatomic,retain) UIColor *pageIndicatorTintColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; @property(nonatomic,retain) UIColor *currentPageIndicatorTintColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;UIProgressView
@property(nonatomic, retain) UIColor* progressTintColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic, retain) UIColor* trackTintColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic, retain) UIImage* progressImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic, retain) UIImage* trackImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UIRefreshControl
@property (nonatomic, retain) NSAttributedString *attributedTitle UI_APPEARANCE_SELECTOR;UISearchBar
@property(nonatomic,retain) UIColor *barTintColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // default is nil @property(nonatomic,retain) UIImage *backgroundImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic,retain) UIImage *scopeBarBackgroundImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;//
- (void)setBackgroundImage:(UIImage *)backgroundImage forBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // Use UIBarMetricsDefaultPrompt to set a separate backgroundImage for a search bar with a prompt - (UIImage *)backgroundImageForBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; - (void)setSearchFieldBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)searchFieldBackgroundImageForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setImage:(UIImage *)iconImage forSearchBarIcon:(UISearchBarIcon)icon state:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)imageForSearchBarIcon:(UISearchBarIcon)icon state:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setScopeBarButtonBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)scopeBarButtonBackgroundImageForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setScopeBarButtonDividerImage:(UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)scopeBarButtonDividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setScopeBarButtonTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (NSDictionary *)scopeBarButtonTitleTextAttributesForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UISearchBar
@property(nonatomic) UIOffset searchFieldBackgroundPositionAdjustment NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic) UIOffset searchTextPositionAdjustment NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
<pre name="code" class="objc">- (void)setPositionAdjustment:(UIOffset)adjustment forSearchBarIcon:(UISearchBarIcon)icon NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
- (UIOffset)positionAdjustmentForSearchBarIcon:(UISearchBarIcon)icon NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UISegmentedControl// 背景图片
- (void)setBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;//分割线图片
- (void)setDividerImage:(UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)dividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;// 文字富文本
- (void)setTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (NSDictionary *)titleTextAttributesForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;// 位置相关
- (void)setContentPositionAdjustment:(UIOffset)adjustment forSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIOffset)contentPositionAdjustmentForSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UISlider
// 已滑过的线颜色
@property(nonatomic,retain) UIColor *minimumTrackTintColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;// 未滑过线颜色
@property(nonatomic,retain) UIColor *maximumTrackTintColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;// 滑动圆片颜色
@property(nonatomic,retain) UIColor *thumbTintColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UIStepper
// 背景图片
- (void)setBackgroundImage:(UIImage*)image forState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (UIImage*)backgroundImageForState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;// 分割图片
- (void)setDividerImage:(UIImage*)image forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (UIImage*)dividerImageForLeftSegmentState:(UIControlState)state rightSegmentState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;// 增加部分
- (void)setIncrementImage:(UIImage *)image forState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (UIImage *)incrementImageForState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;// 减少部分
- (void)setDecrementImage:(UIImage *)image forState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (UIImage *)decrementImageForState:(UIControlState)state NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;UISwitch
@property(nonatomic, retain) UIColor *onTintColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic, retain) UIColor *thumbTintColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; @property(nonatomic, retain) UIImage *onImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; @property(nonatomic, retain) UIImage *offImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;UITabBar
@property(nonatomic,retain) UIColor *barTintColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // default is nil @property(nonatomic,retain) UIColor *selectedImageTintColor NS_DEPRECATED_IOS(5_0,8_0,"Use tintColor") UI_APPEARANCE_SELECTOR; @property(nonatomic,retain) UIImage *backgroundImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic,retain) UIImage *selectionIndicatorImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; @property(nonatomic,retain) UIImage *shadowImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; @property(nonatomic) UITabBarItemPositioning itemPositioning NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; @property(nonatomic) CGFloat itemWidth NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; @property(nonatomic) CGFloat itemSpacing NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; @property(nonatomic) UIBarStyle barStyle NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;UITabBarItem
- (void)setTitlePositionAdjustment:(UIOffset)adjustment NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIOffset)titlePositionAdjustment NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;UITableView
@property (nonatomic) UIEdgeInsets separatorInset NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // allows customization of the frame of cell separators @property (nonatomic, retain) UIColor *sectionIndexColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; // color used for text of the section index// 索引条背景图片
@property (nonatomic, retain) UIColor *sectionIndexBackgroundColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // the background color of the section index while not being touched @property (nonatomic, retain) UIColor *sectionIndexTrackingBackgroundColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; // the background color of the section index while it is being touched// 分割线 - 实际上是高度1颜色浅灰的UIView
@property (nonatomic, retain) UIColor *separatorColor UI_APPEARANCE_SELECTOR; // default is the standard separator gray//
@property (nonatomic, copy) UIVisualEffect *separatorEffect NS_AVAILABLE_IOS(8_0) UI_APPEARANCE_SELECTOR; // effect to apply to table separatorsUITableViewCell
@property (nonatomic) UIEdgeInsets separatorInset NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // allows customization of the separator frameUIToolBar
@property(nonatomic,retain) UIColor *barTintColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // default is nil
- (void)setBackgroundImage:(UIImage *)backgroundImage forToolbarPosition:(UIBarPosition)topOrBottom barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIImage *)backgroundImageForToolbarPosition:(UIBarPosition)topOrBottom barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (void)setShadowImage:(UIImage *)shadowImage forToolbarPosition:(UIBarPosition)topOrBottom NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; - (UIImage *)shadowImageForToolbarPosition:(UIBarPosition)topOrBottom NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;UIView
@property(nonatomic,copy) UIColor *backgroundColor UI_APPEARANCE_SELECTOR; // default is nil. Can be useful with the appearance proxy on custom UIView subclasses.
参考文章:点这里