iOS UIAppearance使用详解(统一设置navigationBar属性)

简介

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,

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];

//设置返回按钮图片和tintColor

[UINavigationBar appearance].backIndicatorImage = 

[UIImage imageNamed:@"backIndicator"];

 [UINavigationBar appearance].backIndicatorTransitionMaskImage = 

[UIImage imageNamed:@"backIndicator"];

[UINavigationBar appearance].tintColor = [UIColor colorWithHexString:@"#333333"];

//设置navigationBar文字属性

UIBarButtonItem *
barItemInNavigationBarAppearance = [UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil];

[barItemInNavigationBarAppearance setTitleTextAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:15]} forState:UIControlStateNormal];

[barItemInNavigationBarAppearance setTitleTextAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:15]} forState:UIControlStateDisabled];

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"]];

//设置选择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];

6.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都变成灰色的

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