IOS--纯代码方式编写View

 1 #import "AppDelegate.h"
 2 #import "TestController.h"
 3 
 4 @interface AppDelegate ()
 5 @property(nonatomic,strong)TestController *controller;
 6 @end
 7 
 8 @implementation AppDelegate
 9 
10 
11 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
12     // Override point for customization after application launch.
13     self.window = [[UIWindow alloc]init];
14 
15     self.controller = [[TestController alloc]init];
16 
17     self.window.rootViewController = self.controller;
18     
19     [self.window makeKeyAndVisible];
20     return YES;
21 }

 1 #import "TestController.h"
 2 #import "RootView.h"
 3 
 4 @interface TestController()
 5 
 6 @property(nonatomic,strong)RootView *rootView;
 7 
 8 @end
 9 
10 @implementation TestController
11 
12 - (void)viewDidLoad
13 {
14     [super viewDidLoad];
15     
16     self.rootView = [[RootView alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
17     self.view = self.rootView;
18 }
19 
20 @end

 1 #import "RootView.h"
 2 
 3 @interface RootView()
 4 
 5 @end
 6 
 7 @implementation RootView
 8 
 9 -(instancetype)initWithFrame:(CGRect)frame
10 {
11     self = [super initWithFrame:frame];
12     if (self) {
13         self.backgroundColor = [UIColor blueColor];
14     }
15     return self;
16 }
17 
18 @end