//

//  ViewController.m

//  UIWindowRelated

//

//  Created by YouXianMing on 14/10/25.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    NSLog(@"-------");

    NSLog(@"%@", [UIApplication sharedApplication].keyWindow);

    NSLog(@"%@", [[[UIApplication sharedApplication] delegate] window]);

}

- (void)viewDidAppear:(BOOL)animated {

    NSLog(@"#######");

    NSLog(@"%@", [UIApplication sharedApplication].keyWindow);

    NSLog(@"%@", [[[UIApplication sharedApplication] delegate] window]);

}

@end

//

//  UIWindow+Window.h

//  Window

//

//  Created by YouXianMing on 14-10-10.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface UIWindow (Window)

/**

 *  返回keyWindow（如果keyWindow有值，代表着你可以给window添加view了）

 *

 *  @return 可以添加view并显示出来的window（如果返回为nil，说明你不能将view添加到window上去显示）

 */

+ (UIWindow *)usableWindow;

/**

 *  返回window

 *

 *  @return window（你给这个window添加的view很有可能被控制器的view覆盖而显示不了）

 */

+ (UIWindow *)rootWindow;

@end

//

//  UIWindow+Window.m

//  Window

//

//  Created by YouXianMing on 14-10-10.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "UIWindow+Window.h"

@implementation UIWindow (Window)

+ (UIWindow *)usableWindow

{

    return [UIApplication sharedApplication].keyWindow;

}

+ (UIWindow *)rootWindow

{

    return [[[UIApplication sharedApplication] delegate] window];

}

@end