UIView xib在UIViewController中加载问题

Question

I have 3 UIViews (lets call them HeaderView , MainView and FooterView ) with UIButtons , Label , etc which I have set up in their respective xibs . I have connected the elements through IBOutlets in the respective .h files. In each of the .m files' drawRect , I have written some set up instructions like setting the colour of the text, setting an image for the UIButton , etc. I have a UIViewController which is presented from a button click event. In this UIViewController , I have called loadNib methods for the 3 UIViews with specified frame.

The issue I'm facing is that none of the elements are being shown, for example, for one of the UIViews ( HeaderView ), the button and label is shown (checked it through ViewDebugging ) but the images or the texts aren't set for some reason.

I'm sorry if I have not explained it properly but I have tried calling addSubview and bringSubviewToFront for the UIButton and Label for the UIViews as well and it just doesn't show up. Any help would be great. If someone could even direct me in the right direction, that would be really helpful. I have been frustratingly stuck on this and am lost as to what I should do.

Thanks a lot for your help in advance!

Answer 1

1. Check weather you use auto layout classes .

2. if yes try once by disabling them and either .

3. Add View in ViewDidAppear Delegate Method to add view

4. Or try on button click to add if u dont want to disable the size classes..

actually size classes have more priority then dynamic CGRectMake frames before ViewDidAppear . After ViewDidAppear priority goes to frames.

.Please try this one and reply whether it works or not .

                    Thanks

Answer 2

You must take into consideration when are you creating the views from the xibs and adding them to the view hierarchy.

Typically you must do something like:

@implementation MYViewController 
{
    UIView *_headerView;
    UIView *_mainView;
    UIView *_footerView;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    _headerView = [[[UINib nibWithNibName:@"HeaderView" bundle:nil] instantiateWithOwner:nil options:nil] firstObject];
    _mainView = [[[UINib nibWithNibName:@"MainView" bundle:nil] instantiateWithOwner:nil options:nil] firstObject];
    _footerView = [[[UINib nibWithNibName:@"FooterView" bundle:nil] instantiateWithOwner:nil options:nil] firstObject];

    _headerView.translatesAutoresizingMaskIntoConstraints = NO;
    _mainView.translatesAutoresizingMaskIntoConstraints = NO;
    _footerView.translatesAutoresizingMaskIntoConstraints = NO;

    [self.view addSubview:_headerView];
    [self.view addSubview:_mainView];
    [self.view addSubview:_footerView];

    // Set here autolayouts for _headerView, _mainView and _footerView
}
@end

Also, you could configure your views as IBOutlets and use the file owner of the xib to assign the views (by setting the file owner of each XIB of header, main and footer views as a MYViewController class and assigning the view to the corresponding file's owner IBOutlet property):

@implementation MYViewController 
{
    IBOutlet UIView *_headerView;
    IBOutlet UIView *_mainView;
    IBOutlet UIView *_footerView;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[UINib nibWithNibName:@"HeaderView" bundle:nil] instantiateWithOwner:self options:nil];
    [[UINib nibWithNibName:@"MainView" bundle:nil] instantiateWithOwner:self options:nil];
    [[UINib nibWithNibName:@"FooterView" bundle:nil] instantiateWithOwner:self options:nil];

    _headerView.translatesAutoresizingMaskIntoConstraints = NO;
    _mainView.translatesAutoresizingMaskIntoConstraints = NO;
    _footerView.translatesAutoresizingMaskIntoConstraints = NO;

    [self.view addSubview:_headerView];
    [self.view addSubview:_mainView];
    [self.view addSubview:_footerView];

    // Set here autolayouts for _headerView, _mainView and _footerView
}

@end

Also, check your autolayout/autoresize implementation and add some NSLog flags on your views (on the method -awakeFromNib ) to check if the view is loaded or not.