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标题 iOS中UIAppearance使用
内容
    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。
    支持UIAppearance协议的类可以访问appearance selector ,它为receiver返回appearance proxy,我么可以给proxy发一些消息,诸如setTintColor:等
    但是它并不是支持所有的UI类。下面列出它支持的类
    1.UIActivitiIndicatorView
    2.UIBarButtonItem
    3.UIBarItem
    4.UINavgationBar
    5.UIPopoverControll
    6.UIProgressView
    7.UISearchBar
    8.UISegmentControll
    9.UISlider
    10.UISwitch
    11.UITabBar
    12.UITabBarItem
    13.UIToolBar
    14.UIView
    15.UIViewController
    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:navBackgroundImgforBarMetrics: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 =[[UIImageimageNamed:@"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: [NSValuevalueWithCGSize:CGSizeMake(1, 1)]};
    [appearance setTitleTextAttributes:textAttributes1 forState:1];
    NSDictionary *textAttributes2 = @{UITextAttributeFont: [UIFont systemFontOfSize:18],
    UITextAttributeTextColor: [UIColor whiteColor],
    UITextAttributeTextShadowColor: [UIColor blackColor],
    UITextAttributeTextShadowOffset: [NSValuevalueWithCGSize: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: [UIFontsystemFontOfSize:18],
    UITextAttributeTextColor: [UIColorblueColor],
    UITextAttributeTextShadowColor: [UIColorwhiteColor],
    UITextAttributeTextShadowOffset: [NSValuevalueWithCGSize: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];
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更新时间:2025/5/21 20:57:32