[XCode] alpha값 사용않하고 배경색 지우는 방법

Interface Builder를(alpha=0) 이용하지 않고, 소스상에서 배경색을 지우는 방법입니다

[UIColor clearColor];


아래의 소스를 이용해서 직접 확인해 보세요

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptons {

    UILabel *notClearedbackground = [[UILabel alloc] initWithFrame:CGRectMake(20.0f, 100.0f, 280.0f, 50.0f)];
    [notClearedbackground setText:@"I have a background color"];
    [window addSubview:notClearedbackground];
    [notClearedbackground release];

    UILabel *clearedbackground = [[UILabel alloc] initWithFrame:CGRectMake(20.0f, 200.0f, 280.0f, 50.0f)];
    [clearedbackground setText:@"I'm transparent background"];
    [clearedbackground setBackgroundColor:[UIColor clearColor]];
    [window addSubview:clearedbackground];
    [clearedbackground release];

    [window setBackgroundColor:[UIColor grayColor]];
    [window makeKeyAndVisible];
}
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