UIVIew与UIWindow1
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
/*----------------------代码创建窗口 加载窗口---------------------------*/
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor cyanColor];
//Makes the receiver the key window and visible.
//receiver表示调用该方法的对象
//表示window对象接收了一个消息（让window作为主窗口和显示）
[self.window makeKeyAndVisible];
// [self.window makeKeyWindow];//设置为主窗口
/*----------------------xib 加载窗口---------------------------*/
// NSBundle *mainBoudle = [NSBundle mainBundle];
// //获取xib文件中的视图（窗口）
// NSArray *arr =[mainBoudle loadNibNamed:@"Empty" owner:self options:nil];
// self.window = [arr lastObject];
//
// [self.window makeKeyAndVisible];//设置为主窗口并显示
// [self.window makeKeyWindow];//设置为主窗口
UIWindow *newWindow = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 375, 20)];
newWindow.backgroundColor = [UIColor redColor];
newWindow.hidden = NO;//新创建的窗口默认隐藏
//如果主窗口无法显示 窗口上的视图同样无法显示
[self.window addSubview:newWindow];
return YES;
}
- (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
- (void)applicationWillTerminate:(UIApplication *)application {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
@end