UILabel is not shown in custom UIView screen - ios

Question

Here is how I implemented my custom UiView
In myView.h file
#interface myView : UIView
{
NSString *message;
}
...
#property (nonatomic, retain) UILabel *messageLabel;
...
#end
In myView.m file
This function will instantiate myView and add the message label to it
+ (id) initWithText:(NSString *) text
{
screenBounds = [[UIScreen mainScreen] bounds];
CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
self = [super initWithFrame:CGRectMake(0, statusBarFrame.size.height, screenBounds.size.width, 40)];
if (self)
{
[self setBackgroundColor:[UIColor redColor]];
message = [text copy];
_messageLabel = [[UILabel alloc]initWithFrame:[self frame]];
[_messageLabel setText:message];
[_messageLabel setAdjustsFontSizeToFitWidth:YES];
[_messageLabel setTextAlignment:NSTextAlignmentJustified];
[_messageLabel setTextColor:[ UIColor blackColor]];
[self addSubview:_messageLabel];
}
return self;
}
Later I add myView as a subclass to the visible view in my screen. When I run the app I can see the red coloured myView but message label is not displayed in it.

Answer 1

When you init your UILabel with self.frame, you have to consider the value inside its parent view.
Maybe your 2nd parameter: y = statusBarFrame.size.height is to high and that's why your label is out your view ?
Try to init your label with CGRectMake(0,0,self.frame.width, self.frame.height)

Answer 2

check if text you are setting in label is blank and
_messageLabel = [[UILabel alloc]initWithFrame:self.frame];

Answer 3

I Tried this code And it worked. Sure that you didn't set other parameters to your UILabel somewhere else ? These are the differences with your code :
I replaced your '+' by '-' for the method.
I changed uilabel frame for initialisation.
Added a background color to label (only to check).
-(id)initWithText:(NSString *)text
{
CGRect screenBounds = [[UIScreen mainScreen] bounds];
CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
self = [super initWithFrame:CGRectMake(0, statusBarFrame.size.height, screenBounds.size.width, 40)];
if (self) {
[self setBackgroundColor:[UIColor redColor]];
NSString *message = [text copy];
UILabel *_messageLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
[_messageLabel setText:message];
[_messageLabel setBackgroundColor:[UIColor lightTextColor]];
[_messageLabel setAdjustsFontSizeToFitWidth:YES];
[_messageLabel setTextAlignment:NSTextAlignmentJustified];
[_messageLabel setTextColor:[ UIColor blackColor]];
[self addSubview:_messageLabel];
}
return self;
}

Answer 4

Before: I used to call initWithText() & show() from backgroundOP.m file where I do background operations. These functions are always executed in separate threads.
Now: I moved the call to initWithText() & show() method inside a delegate method and added the delegate to presenting UIViewController i.e., inside the viewController.m file in which I want my view to appear. Now I call this delegate from another file (i.e., from backgroundOP.m) and problem is solved. Now both UIView and UILabel is visible in screen.
But I don't understand why adding the UIView from the background thread function shows only the UIView and not its contents/subviews.
In my show() function, I use this dispatch queue to add the myView to presenting key window. Like below code
UIWindow *window = [[UIApplication sharedApplication] keyWindow];
dispatch_async(dispatch_get_main_queue(), ^{
[window addSubview:self]; // self represents myView object
});
If someones knows the reason for this behaviour, please enlighten me.