iOS开发】---- 强大的UI修改工具 UIAppearance

iOS5及其之后提供了一个比较强大的工具UIAppearance，能够轻松的统一你的界面，它提供以下两个方法：

• (id)appearance

• (id)appearanceWhenContainedIn:(Class <>)ContainerClass,... 第一个方法是统一所有改，好比你设置UINavBar的tintColor，你能够这样写：[[UINavigationBar
  appearance] setTintColor:myColor]; 第二个方法是当出如今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外观修改以下：
  
     首先定义两个值： [csharp] view plaincopy在CODE上查看代码片派生到个人代码片  //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

代码以下：

[csharp] view plaincopy在CODE上查看代码片派生到个人代码片 //导航条 {

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

2.标签栏（UITabbar）

代码以下：

[csharp] view plaincopy在CODE上查看代码片派生到个人代码片 //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）

代码以下：

[csharp] view plaincopy在CODE上查看代码片派生到个人代码片 //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因为带有箭头，须要单独设置。

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

代码以下：

[csharp] view plaincopy在CODE上查看代码片派生到个人代码片 //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）

代码以下：

[csharp] view plaincopy在CODE上查看代码片派生到个人代码片 //toolBar {

appearance = [UIToolbar appearance];  
//样式和背景二选一便可，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];   }