CODEWITHSUNDEEP
objective-c
Luciano Nascimento
Luciano Nascimento

Reputation: 2600

View with wrong height (same as parent)

I extended the UIView class to create an overlay load screen.

FullLoadingView.h

#import <UIKit/UIKit.h>

@interface FullLoadingView : UIView

+ (instancetype)showOnView:(UIView *)view;
+ (void)hideAll:(UIView *)view;

- (void)hide;

@end

FullLoadingView.m

#import "FullLoadingView.h"

@implementation FullLoadingView

+ (instancetype)showOnView:(UIView *)view
{
    FullLoadingView *fullLoadingView = [[self alloc] init];
    [fullLoadingView setFrame:view.bounds];
    [fullLoadingView setBackgroundColor:[UIColor colorWithRed:(250.0/255.0) green:(250.0/255.0) blue:(250.0/255.0) alpha:1.0]];

    UIActivityIndicatorView *activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    activityIndicatorView.center = fullLoadingView.center;
    [activityIndicatorView startAnimating];

    [view addSubview:fullLoadingView];

    return fullLoadingView;
}

- (void)hide
{
    [self removeFromSuperview];
}

+ (void)hideAll:(UIView *)view
{
    NSEnumerator *subviewsEnum = [view.subviews reverseObjectEnumerator];
    for (UIView *subview in subviewsEnum) {
        if ([subview isKindOfClass:self]) {
            FullLoadingView *fullLoadingView = (FullLoadingView *)subview;
            [fullLoadingView removeFromSuperview];
        }
    }
}

@end

UIViewController code:

- (void)viewDidLoad {
    FullLoadingView *fullLoadingView = [FullLoadingView showOnView:self.view];
}

Issue: When the UIViewController has NavigationBar or TabBar the central alignment of the UIActivityIndicatorView is not correct.

PS: The self.view has the correct height (excludingNavigationBar or TabBar) butFullLoadingView always has full height of the device.

inserir a descrição da imagem aqui

Upvotes: 0

Views: 37

Answers (1)

rob mayoff
rob mayoff

Reputation: 385500

You're creating fullLoadingView in viewDidLoad, but self.view's frame is not guaranteed to be correct for the current device until viewDidLayoutSubviews.

Probably the simplest fix is to use autoresizingMask to keep the frames in sync:

+ (instancetype)showOnView:(UIView *)view
{
    FullLoadingView *fullLoadingView = [[self alloc] init];
    fullLoadingView.frame = view.bounds;
    fullLoadingView.autoresizingMask = (
        UIViewAutoresizingFlexibleWidth
        | UIViewAutoresizingFlexibleHeight);
    fullLoadingView.backgroundColor = [UIColor colorWithRed:(250.0/255.0) green:(250.0/255.0) blue:(250.0/255.0) alpha:1.0];

    UIActivityIndicatorView *activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    activityIndicatorView.center = fullLoadingView.center;
    activityIndicatorView.autoresizingMask = (
        UIViewAutoresizingFlexibleTopMargin
        | UIViewAutoresizingFlexibleBottomMargin
        | UIViewAutoresizingFlexibleLeftMargin
        | UIViewAutoresizingFlexibleRightMargin);
    [fullLoadingView addSubview:activityIndicatorView];
    [activityIndicatorView startAnimating];

    [view addSubview:fullLoadingView];

    return fullLoadingView;
}

Upvotes: 2

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