UIAppearance相关

UIAppearance是一个协议，只有遵守UIAppearance协议并且实现它的方法的类才能使用UIAppearance

只有在控件显示之前设置才有效

iOS5及其以后提供了一个比较强大的工具UIAppearance，我们通过UIAppearance设置一些UI的全局效果，这样就可以很方便的实现UI的自定义效果又能最简单的实现统一界面风格，它提供如下两个方法。

+ (id)appearance

这个方法是统一全部改，比如你设置UINavBar的tintColor，你可以这样写：

[[UINavigationBar appearance] setTintColor:myColor];

+ (id)appearanceWhenContainedIn:(Class <>)ContainerClass,...

+ (instancetype)appearanceWhenContainedInInstancesOfClasses:(NSArray<Class <UIAppearanceContainer>> *)containerTypes NS_AVAILABLE_IOS(9_0);

这个方法可设置某个类的改变：例如：设置UIBarButtonItem 在UINavigationBar、UIPopoverController、UITabbar中的效果。就可以这样写

[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], [UIPopoverController class],[UITabbar class] nil] setTintColor:myPopoverNavBarColor];

请注意:使用appearance设置UI效果最好采用全局的设置，在所有界面初始化前开始设置，否则可能失效。

具体UI外观修改如下：

1.修改导航栏背景代码如下：

UINavigationBar * appearance = [UINavigationBar appearance];
UIImage *navBackgroundImg =[UIImage imageNamed:@"navBg.png”];

[appearance setBackgroundImage:navBackgroundImg forBarMetrics:UIBarMetricsDefault];

2.标签栏（UITabbar）代码如下：

UITabBar *appearance = [UITabBar appearance];
//设置背景图片
[appearance setBackgroundImage:[UIImage imageNamed:@"tabbar_bg.png"]];
//门置选择item的背景图片
UIImage * selectionIndicatorImage =[[UIImage imageNamed:@"tabbar_slider"]resizableImageWithCapInsets:UIEdgeInsetsMake(4, 0, 0, 0)] ;
[appearance setSelectionIndicatorImage:selectionIndicatorImage];

3.分段控件（UISegmentControl）代码如下：

UISegmentedControl *appearance = [UISegmentedControl appearance];

//Segmenteg正常背景
[appearance setBackgroundImage:[UIImage imageNamed:@"Segmente.png"]
                      forState:UIControlStateNormal
                    barMetrics:UIBarMetricsDefault];

//Segmente选中背景
[appearance setBackgroundImage:[UIImage imageNamed:@"Segmente_a.png"]
                      forState:UIControlStateSelected
                    barMetrics:UIBarMetricsDefault];

//Segmente左右都未选中时的分割线
//BarMetrics表示navigation bar的状态，UIBarMetricsDefault 表示portrait状态（44pixel height），UIBarMetricsLandscapePhone 表示landscape状态（32pixel height）

[appearance setDividerImage:[UIImage imageNamed:@"Segmente_line.png"]
        forLeftSegmentState:UIControlStateNormal
          rightSegmentState:UIControlStateNormal
                 barMetrics:UIBarMetricsDefault];

[appearance setDividerImage:[UIImage imageNamed:@"Segmente_line.png"]
        forLeftSegmentState:UIControlStateSelected
          rightSegmentState:UIControlStateNormal
                 barMetrics:UIBarMetricsDefault];

[appearance setDividerImage:[UIImage imageNamed:@"Segmente_line.png"]
        forLeftSegmentState:UIControlStateNormal
          rightSegmentState:UIControlStateSelected
                 barMetrics:UIBarMetricsDefault];

//字体
NSDictionary *textAttributes1 = @{UITextAttributeFont: [UIFont systemFontOfSize:18],
                                 UITextAttributeTextColor: [UIColor blueColor],
                                 UITextAttributeTextShadowColor: [UIColor whiteColor],
                                 UITextAttributeTextShadowOffset: [NSValue valueWithCGSize:CGSizeMake(1, 1)]};

[appearance setTitleTextAttributes:textAttributes1 forState:1];

NSDictionary *textAttributes2 = @{UITextAttributeFont: [UIFont systemFontOfSize:18],
                                 UITextAttributeTextColor: [UIColor whiteColor],
                                 UITextAttributeTextShadowColor: [UIColor blackColor],
                                 UITextAttributeTextShadowOffset: [NSValue valueWithCGSize:CGSizeMake(1, 1)]};

[appearance setTitleTextAttributes:textAttributes2 forState:0];

4.UIBarbutton 注意：UIBarbutton有leftBarButton，rightBarButton和backBarButton，其中backBarButton由于带有箭头，需要单独设置。

barButton背景设置是ios6.0及以后的，而backbutton是ios5.0及以后的，这里要注意！

代码如下：

//修改导航条上的UIBarButtonItem
UIBarButtonItem *appearance = [UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil];

//设置导航栏的字体包括backBarButton和leftBarButton，rightBarButton的字体
NSDictionary *textAttributes = @{UITextAttributeFont: [UIFont systemFontOfSize:18],
                                 UITextAttributeTextColor: [UIColor blueColor],
                                 UITextAttributeTextShadowColor: [UIColor whiteColor],
                                 UITextAttributeTextShadowOffset: [NSValue valueWithCGSize:CGSizeMake(1, 1)]};

[appearance setTitleTextAttributes:textAttributes forState:1];//forState为0时为下正常状态，为1时为点击状态。


//修改leftBarButton，rightBarButton背景效果
[appearance setBackgroundImage:[UIImage imageNamed:@"navBarButton.png"]
                      forState:UIControlStateNormal
                         style:UIBarButtonItemStyleBordered
                    barMetrics:UIBarMetricsDefault];

[appearance setBackgroundImage:[UIImage imageNamed:@"navBarButton_a.png"]
                      forState:UIControlStateHighlighted
                         style:UIBarButtonItemStyleBordered
                    barMetrics:UIBarMetricsDefault];


//backBarButton需要单独设置背景效果。只能在ios6.0以后才能用
[appearance setBackButtonBackgroundImage:[UIImage imageNamed:@"nav_bg.png"]
                                forState:0
                              barMetrics:UIBarMetricsDefault];

[appearance setBackButtonBackgroundImage:[UIImage imageNamed:@"work.png"]
                                forState:1
                              barMetrics:UIBarMetricsDefault];

[appearance setBackButtonTitlePositionAdjustment:UIOffsetMake(2, -1)
                                   forBarMetrics:UIBarMetricsDefault];

5.工具栏（UIToolbar）

UIToolbar *appearance = [UIToolbar appearance];
//样式和背景二选一即可，看需求了
//样式（黑色半透明，不透明等）设置
[appearance setBarStyle:UIBarStyleBlackTranslucent];
//背景设置
[appearance setBackgroundImage:[UIImage imageNamed:@"toolbarBg.png"]
            forToolbarPosition:UIToolbarPositionAny
                    barMetrics:UIBarMetricsDefault];

所有可以设置的Attributes

/************************ Attributes ************************/

// Predefined character attributes for text. If the key is not in the dictionary, then use the default values as described below.
UIKIT_EXTERN NSString * const NSFontAttributeName NS_AVAILABLE(10_0, 6_0);                // UIFont, default Helvetica(Neue) 12
UIKIT_EXTERN NSString * const NSParagraphStyleAttributeName NS_AVAILABLE(10_0, 6_0);      // NSParagraphStyle, default defaultParagraphStyle
UIKIT_EXTERN NSString * const NSForegroundColorAttributeName NS_AVAILABLE(10_0, 6_0);     // UIColor, default blackColor
UIKIT_EXTERN NSString * const NSBackgroundColorAttributeName NS_AVAILABLE(10_0, 6_0);     // UIColor, default nil: no background
UIKIT_EXTERN NSString * const NSLigatureAttributeName NS_AVAILABLE(10_0, 6_0);            // NSNumber containing integer, default 1: default ligatures, 0: no ligatures
UIKIT_EXTERN NSString * const NSKernAttributeName NS_AVAILABLE(10_0, 6_0);                // NSNumber containing floating point value, in points; amount to modify default kerning. 0 means kerning is disabled.
UIKIT_EXTERN NSString * const NSStrikethroughStyleAttributeName NS_AVAILABLE(10_0, 6_0);  // NSNumber containing integer, default 0: no strikethrough
UIKIT_EXTERN NSString * const NSUnderlineStyleAttributeName NS_AVAILABLE(10_0, 6_0);      // NSNumber containing integer, default 0: no underline
UIKIT_EXTERN NSString * const NSStrokeColorAttributeName NS_AVAILABLE(10_0, 6_0);         // UIColor, default nil: same as foreground color
UIKIT_EXTERN NSString * const NSStrokeWidthAttributeName NS_AVAILABLE(10_0, 6_0);         // NSNumber containing floating point value, in percent of font point size, default 0: no stroke; positive for stroke alone, negative for stroke and fill (a typical value for outlined text would be 3.0)
UIKIT_EXTERN NSString * const NSShadowAttributeName NS_AVAILABLE(10_0, 6_0);              // NSShadow, default nil: no shadow
UIKIT_EXTERN NSString *const NSTextEffectAttributeName NS_AVAILABLE(10_10, 7_0);          // NSString, default nil: no text effect

UIKIT_EXTERN NSString * const NSAttachmentAttributeName NS_AVAILABLE(10_0, 7_0);          // NSTextAttachment, default nil
UIKIT_EXTERN NSString * const NSLinkAttributeName NS_AVAILABLE(10_0, 7_0);                // NSURL (preferred) or NSString
UIKIT_EXTERN NSString * const NSBaselineOffsetAttributeName NS_AVAILABLE(10_0, 7_0);      // NSNumber containing floating point value, in points; offset from baseline, default 0
UIKIT_EXTERN NSString * const NSUnderlineColorAttributeName NS_AVAILABLE(10_0, 7_0);      // UIColor, default nil: same as foreground color
UIKIT_EXTERN NSString * const NSStrikethroughColorAttributeName NS_AVAILABLE(10_0, 7_0);  // UIColor, default nil: same as foreground color
UIKIT_EXTERN NSString * const NSObliquenessAttributeName NS_AVAILABLE(10_0, 7_0);         // NSNumber containing floating point value; skew to be applied to glyphs, default 0: no skew
UIKIT_EXTERN NSString * const NSExpansionAttributeName NS_AVAILABLE(10_0, 7_0);           // NSNumber containing floating point value; log of expansion factor to be applied to glyphs, default 0: no expansion

UIKIT_EXTERN NSString * const NSWritingDirectionAttributeName NS_AVAILABLE(10_6, 7_0);    // NSArray of NSNumbers representing the nested levels of writing direction overrides as defined by Unicode LRE, RLE, LRO, and RLO characters.  The control characters can be obtained by masking NSWritingDirection and NSWritingDirectionFormatType values.  LRE: NSWritingDirectionLeftToRight|NSWritingDirectionEmbedding, RLE: NSWritingDirectionRightToLeft|NSWritingDirectionEmbedding, LRO: NSWritingDirectionLeftToRight|NSWritingDirectionOverride, RLO: NSWritingDirectionRightToLeft|NSWritingDirectionOverride,

UIKIT_EXTERN NSString * const NSVerticalGlyphFormAttributeName NS_AVAILABLE(10_7, 6_0);   // An NSNumber containing an integer value.  0 means horizontal text.  1 indicates vertical text.  If not specified, it could follow higher-level vertical orientation settings.  Currently on iOS, it's always horizontal.  The behavior for any other value is undefined.

UIAppearance相关

UIAppearance相关

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