以編程方式清潔UI的實現

我正在嘗試編程創建的UI的清潔實現。以編程方式清潔UI的實現

我開始與我的AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    self.window.backgroundColor = [UIColor whiteColor]; 


    MainViewController *mainVC = [[MainViewController alloc] init]; 

    UINavigationController *navC = [[UINavigationController alloc] initWithRootViewController:mainVC]; 

    self.window.rootViewController = navC; 

    [self.window makeKeyAndVisible]; 
    return YES; 

}

然後MainViewController.m是UIViewController一個子類實現如下：

- (void)loadView { 

    CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame]; 
    MenuView *contentView = [[MenuView alloc] initWithFrame:applicationFrame]; 
    self.view = contentView; 

}

而定製UIView在MenuView.m實現以下

- (id)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) { 
     // Initialization code 
     NSLog(@"init got called"); 
     NSLog(@"frame size %f %f", self.frame.size.width, self.frame.size.height); 
     self.backgroundColor = [UIColor greenColor]; 
    } 
    return self; 
} 

... 

- (void)loadView { 

    NSLog(@"loadView got called"); 

    UIButton *newButton = [[UIButton alloc] init]; 
    newButton.titleLabel.text = @"New Button"; 
    newButton.backgroundColor = [UIColor blueColor]; 
    [self addSubview:newButton]; 

    NSDictionary *views = NSDictionaryOfVariableBindings(newButton); 

    [newButton setTranslatesAutoresizingMaskIntoConstraints:NO]; 

    NSDictionary *metrics = @{@"buttonWidth": @(150), @"buttonHeight": @(150)}; 

    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(100)-[newButton(buttonWidth)]" 
                   options:0 metrics:metrics views:views]]; 
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[newButton(buttonHeight)]-(100)-|" 
                   options:0 metrics:metrics views:views]]; 

}

當我運行這個時，模擬器顯示我一個綠色的屏幕 - 但沒有按鈕。 init方法中的NSLog會觸發並顯示320 x 548的幀大小，但loadView方法不會被調用。我在做什麼錯？

感謝

來源

2014-09-03 Joseph

我想'loadView'呼籲'UIViewController'子類類不能爲自定義'UIView' – 2014-09-03 11:14:12

OK，我在哪裏設置一個視圖的子視圖？ – Joseph 2014-09-03 11:15:29

嘗試在初始化過程中調用此按鈕創建方法，例如' - （id）initWithFrame：（CGRect）frame {self = [super initWithFrame：frame]; （self）{.... afert一些代碼; [self createBUttonWithProperties]; }返回自我; }'並將自定義'view'中的方法名稱' - （void）loadView'更改爲其他名稱，如' - （void）createBUttonWithProperties' – 2014-09-03 11:17:59

- (void)loadView;

是UIViewController類的方法，而不是UIView的的。

所以你需要在你已經設置背景顏色的init方法裏設置子視圖。

- (id)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) 
    { 
     // Initialization code 
    } 
    return self; 
}

來源

2014-09-03 11:30:18 erkanyildiz

以編程方式清潔UI的實現

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