1>创建程序载入界面- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
//1>创建窗口
self.window= [[UIWindowalloc]initWithFrame:[UIScreenmainScreen].bounds];
//2>设置窗口的根控制器
UITabBarController*tabBarController = [[UITabBarControlleralloc]init];
self.window.rootViewController= tabBarController;
//3>显示窗口
[self.windowmakeKeyAndVisible];
return YES;
}
2>LaunchImage配置 LaunchImage.launchimage文件下的Contents.json文件中记录了LaunchImage的详细配置:
3>取消APP图标渲染
4>程序加载时隐藏状态栏
在程序加载完成后如需恢复状态栏显示,可以在didFinishLaunchingWithOptions方法中调用[applicationsetStatusBarHidden:NO]方法;
5>添加TabBar控制器及其子控制器 自定义一个TabBarViewController类继承UITabBarController类用来创建自定义的TabBarView,并在该类中的viewDidLoad方法中创建子控制器
- (void)viewDidLoad
{
[superviewDidLoad];
//添加子控制器
UIViewController*home = [[UIViewControlleralloc]init];
home.view.backgroundColor= [UIColorredColor];
home.tabBarItem.title=@"首页";
home.tabBarItem.image= [UIImageimageNamed:@"tabbar_home"];
[home.tabBarItemsetSelectedImage:[UIImageimageNamed:@"tabbar_home_selected"]];
[selfaddChildViewController:home];
UIViewController*message = [[UIViewControlleralloc]init];
message.view.backgroundColor= [UIColororangeColor];
message.tabBarItem.title=@"消息";
message.tabBarItem.image= [UIImageimageNamed:@"tabbar_message_center"];
[message.tabBarItemsetSelectedImage:[UIImageimageNamed:@"tabbar_message_center_selected"]];
[selfaddChildViewController:message];
UIViewController*discover = [[UIViewControlleralloc]init];
discover.view.backgroundColor= [UIColorgreenColor];
discover.tabBarItem.title=@"发现";
discover.tabBarItem.image= [UIImageimageNamed:@"tabbar_discover"];
[discover.tabBarItemsetSelectedImage:[UIImageimageNamed:@"tabbar_discover_selected"]];
[selfaddChildViewController:discover];
UIViewController*PRofile = [[UIViewControlleralloc]init];
profile.view.backgroundColor= [UIColorblueColor];
profile.tabBarItem.title=@"我";
profile.tabBarItem.image= [UIImageimageNamed:@"tabbar_profile"];
[profile.tabBarItemsetSelectedImage:[UIImageimageNamed:@"tabbar_profile_selected"]];
[selfaddChildViewController:profile];
}
6>渲染图片 在iOS7中，会对selectedImage的图片再次渲染为蓝色，要想显示原图，就必须要取消渲染；
取消渲染调用的方法：
selectedImage = [selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
7>优化添加子控制器代码 将添加子控制器到TabBarViewController的代码进行优化，建立如下方法：
- (void)addOneChildViewController:(UIViewController*)viewController withTitle:(NSString*)title imageName:(NSString*)imageName selectedImageName:(NSString*)selectedImageName
{
viewController.view.backgroundColor=ZFRandomColor;
viewController.tabBarItem.title= title;
viewController.tabBarItem.image= [UIImageimageNamed:imageName];
UIImage*image = [UIImageimageNamed:selectedImageName];
if(iOS7) {
image = [imageimageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
}
[viewController.tabBarItemsetSelectedImage:image];
[selfaddChildViewController:viewController];
}
其中ZFRandomColor和iOS7为自定义宏,其宏定义在Prefix.pch文件下:
#ifdef __OBJC__
#import<UIKit/UIKit.h>
#import<Foundation/Foundation.h>
#import<CoreData/CoreData.h>
#define ZFRandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0green:arc4random_uniform(256)/255.0blue:arc4random_uniform(256)/255.0alpha:1.0]
#define iOS7 [[UIDevice currentDevice].systemVersion doubleValue] >=7.0
#endif
由于imageWithRenderingMode方法只在iOS7环境下有效,因此此处代码需要添加条件判断语句进行系统适配,通过获取当前运行环境的系统版本来判断是否编译此方法;
8>图片适配 为UIImage添加一个分类,用于image的系统适配:
@implementationUIImage (Extension)
+ (UIImage*)imageWithName:(NSString*)imageName
{
UIImage*image =nil;
if(iOS7) {
NSString*name = [imageNamestringByAppendingString:@"_os7"];
image = [UIImageimageNamed:name];
}
if(!image) {
image = [UIImageimageNamed:imageName];
}
returnimage;
}
@end