【iOS开发】---- 强大的UI修改工具 UIAppearance－有图片效果

 iOS5及其以后提供了一个比较强大的工具UIAppearance，可以轻松的统一你的界面，它提供如下两个方法：

+ (id)appearance

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

第一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];
第二个方法是当出现在某个类的出现时候才会改变：例如：

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

 另外其它的UI外观修改如下：

       首先定义两个值：

//这样方便下面多个UI界面设置，textAttributes:字体  
id appearance;  
NSDictionary *textAttributes = nil;  

1.导航条

代码如下：

//导航条  
{  
    appearance = [UINavigationBar appearance];  
    UIImage *navBackgroundImg =[UIImage imageNamed:@"background_nav"];  
      
    [appearance setBackgroundImage:navBackgroundImg forBarMetrics:UIBarMetricsDefault];  
}  

2.标签栏（UITabbar）

 

代码如下：

//标签栏  
{  
    appearance = [UITabBar appearance];  
    UIImage *tabBarBackGroungImg =[UIImage imageNamed:@"tabbar_background"];  
    [appearance setBackgroundImage:tabBarBackGroungImg];  
      
    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：

//Segmente未选中背景  
{  
    //cap insets用来指定哪些区域是固定不变的，未制定的区域则会repeat  
    UIImage *segmentSelected = [[UIImage imageNamed:@"bg_o.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];  
      
    UIImage *segmentUnselected = [[UIImage imageNamed:@"bg.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];  
      
    UIImage *segmentSelectedUnselected = [UIImage imageNamed:@"line.png"] ;  
      
    UIImage *segUnselectedSelected = [UIImage imageNamed:@"line.png"] ;  
      
    UIImage *segmentUnselectedUnselected = [UIImage imageNamed:@"line.png"];  
      
      
    appearance = [UISegmentedControl appearance];  
      
    [appearance setBackgroundImage:segmentUnselected  
                          forState:stateNormal  
                        barMetrics:UIBarMetricsDefault];  
      
    //Segmente选中背景  
    [appearance setBackgroundImage:segmentSelected  
                          forState:stateSelected  
                        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:segmentUnselectedUnselected  
            forLeftSegmentState:stateNormal  
              rightSegmentState:stateNormal  
                     barMetrics:UIBarMetricsDefault];  
      
    [appearance setDividerImage:segmentSelectedUnselected  
            forLeftSegmentState:stateSelected  
              rightSegmentState:stateNormal  
                     barMetrics:UIBarMetricsDefault];  
      
    [appearance setDividerImage:segUnselectedSelected  
            forLeftSegmentState:stateNormal  
              rightSegmentState:stateSelected  
                     barMetrics:UIBarMetricsDefault];  
      
    //字体  
    textAttributes = [NSDictionary dictionaryWithObjectsAndKeys:  
                      BAR_BUTTON_TITLE_SHADOW_COLOR,UITextAttributeTextColor,  
                      BAR_BUTTON_TITLE_FONT,UITextAttributeFont,  
                      BAR_BUTTON_TITLE_TEXT_COLOR,UITextAttributeTextShadowColor,  
                      [NSValue valueWithCGSize:CGSizeMake(1, 1)],UITextAttributeTextShadowOffset,  
                      nil];  
      
    [appearance setTitleTextAttributes:textAttributes forState:1];  
      
    textAttributes = [NSDictionary dictionaryWithObjectsAndKeys:  
                      BAR_BUTTON_TITLE_TEXT_COLOR,UITextAttributeTextColor,  
                      BAR_BUTTON_TITLE_FONT,UITextAttributeFont,  
                      BAR_BUTTON_TITLE_SHADOW_COLOR,UITextAttributeTextShadowColor,  
                      [NSValue valueWithCGSize:CGSizeMake(1, 1)],UITextAttributeTextShadowOffset,  
                      nil];  
      
    [appearance setTitleTextAttributes:textAttributes 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：

//UIBarButtonItem  
{  
    //只是修改导航条上的UIBarButtonItem  
    appearance = [UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil];  
    //backBarButton和leftBarButton，rightBarButton的字体同时设置  
    textAttributes = [NSDictionary dictionaryWithObjectsAndKeys:  
                      BAR_BUTTON_TITLE_TEXT_COLOR,UITextAttributeTextColor,  
                      BAR_BUTTON_TITLE_FONT,UITextAttributeFont,  
                      BAR_BUTTON_TITLE_SHADOW_COLOR,UITextAttributeTextShadowColor,  
                      [NSValue valueWithCGSize:CGSizeMake(1, 1)],UITextAttributeTextShadowOffset,  
                      nil];  
      
    [appearance setTitleTextAttributes:textAttributes forState:0];  
      
    textAttributes = [NSDictionary dictionaryWithObjectsAndKeys:  
                      BAR_BUTTON_TITLE_SHADOW_COLOR,UITextAttributeTextColor,  
                      BAR_BUTTON_TITLE_FONT,UITextAttributeFont,  
                      BAR_BUTTON_TITLE_TEXT_COLOR,UITextAttributeTextShadowColor,  
                      [NSValue valueWithCGSize:CGSizeMake(1, 1)],UITextAttributeTextShadowOffset,  
                      nil];  
      
    [appearance setTitleTextAttributes:textAttributes forState:1];  
      
    UIImage *leftButton = [[UIImage imageNamed:@"bgLeftButton.png"] stretchableImageWithLeftCapWidth:14 topCapHeight:0];  
      
    UIImage *normalButton = [[UIImage imageNamed:@"bgNormalButton.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 5, 0, 5)];  
      
    //leftBarButton，rightBarButton背景  
    [appearance setBackgroundImage:normalButton  
                          forState:UIControlStateNormal  
                             style:UIBarButtonItemStyleBordered  
                        barMetrics:UIBarMetricsDefault];  
      
    [appearance setBackgroundImage:normalButton  
                          forState:UIControlStateHighlighted  
                             style:UIBarButtonItemStyleBordered  
                        barMetrics:UIBarMetricsDefault];  
      
    //单独设置backBarButton背景  
    [appearance setBackButtonBackgroundImage:leftButton  
                                    forState:0  
                                  barMetrics:UIBarMetricsDefault];  
      
    [appearance setBackButtonBackgroundImage:leftButton  
                                    forState:1  
                                  barMetrics:UIBarMetricsDefault];  
      
    [appearance setBackButtonTitlePositionAdjustment:UIOffsetMake(2, -1)  
                                       forBarMetrics:UIBarMetricsDefault];  
      
}  

5.工具栏（UIToolbar）

 

代码如下：

//toolBar  
{  
    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:@"background_nav.png"]  
                forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];  
}  

补充一个需要注意的地方：全局的设置最好在所有界面初始化前开始设置，否则可能失效。