iphone - 将子视图添加到另一个子视图不起作用

Question

我正在尝试将标签（headerLabel）添加到另一个子视图（introPadTutorial），但它没有显示在屏幕上。有人可以帮我在哪里犯错吗？

//Header file

@property (nonatomic, retain) UIView *introPadTutorial;

//Implementation file

@synthesize introPadTutorial;

UIView *v = [_appDelegate getCurrentView];
CGRect tutorialFrame = [self getTableViewFrame];

introPadTutorial = [[UIView alloc] initWithFrame:CGRectMake(v.frame.size.width, 80, -tutorialFrame.size.width, v.frame.size.height)];
[introPadTutorial setBackgroundColor:[UIColor uberLightGray]];
[introPadTutorial setUserInteractionEnabled:YES];

UILabel *headerLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 180, 180)];
[headerLabel setText:@"test test test"];
[headerLabel setBackgroundColor:[UIColor greenColor]];
[headerLabel setFont:[UIFont boldSystemFontOfSize:16.0f]];
[headerLabel setTextColor:[UIColor redColor]];
[headerLabel setShadowColor:[UIColor whiteColor]];
[headerLabel setShadowOffset:CGSizeMake(0, 1)];

[self.introPadTutorial addSubview:headerLabel];
[headerLabel release];

[v addSubview:introPadTutorial];
[introPadTutorial release];

Answer 1

你的introPadTutorial观点出现了吗？initWithFrame你在它的调用中有一个负宽度。

Answer 2

可能是你的...

introPadTutorial = [[UIView alloc] initWithFrame:CGRectMake(v.frame.size.width, 80, -tutorialFrame.size.width, v.frame.size.height)];

其实应该...

introPadTutorial = [[UIView alloc] initWithFrame:CGRectMake(0, 80, tutorialFrame.size.width, v.frame.size.height)];

Answer 3

不要使用负宽度来改变位置，使用原点来改变位置。

用这个：

introPadTutorial = [[UIView alloc] initWithFrame:CGRectMake(v.frame.size.width - tutorialFrame.size.width, 80, tutorialFrame.size.width, v.frame.size.height)];

我认为这应该有助于使子视图真正出现。