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How do you add multi-line text to a UIButton?

I have the following code...

UILabel *buttonLabel = [[UILabel alloc] initWithFrame:targetButton.bounds];
buttonLabel.text = @"Long text string";
[targetButton addSubview:buttonLabel];
[targetButton bringSubviewToFront:buttonLabel];

...the idea being that I can have multi-line text for the button, but the text is always obscured by the backgroundImage of the UIButton. A logging call to show the subviews of the button shows that the UILabel has been added, but the text itself cannot be seen. Is this a bug in UIButton or am I doing something wrong?

How to capture UIView to UIImage without loss of quality on retina display

My code works fine for normal devices but creates blurry images on retina devices.

Does anybody know a solution for my issue?

+ (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContext(view.bounds.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return img;
}

Achieving bright, vivid colors for an iOS 7 translucent UINavigationBar

iOS 7.1 UPDATE: Looks like the workaround for modifying the alpha channel in the UINavigationBar has been ignored in this update. Right now, the best solution seems to be to just 'deal with it' and hope that whatever color you choose can render a translucent effect. I am still looking into ways of getting around this.

iOS 7.0.3 UPDATE: The GitHub library we created has been updated to slightly work around this issue when using iOS 7.0.3. Unfortunately, there is no magic formula to support both colors created in iOS 7.0.2 and earlier and iOS 7.0.3. Seems like Apple improved the saturation, but at the cost of opacity (since the blurred translucency is dependant on the opacity level). I, along with a few others, are working on creating a much better fix for this.

I'm sure many people have already come across the problem where iOS 7 tends to desaturate the color of a UINavigationBar that is translucent.

My goal is to achieve a UINavigationBar with this tint color, but translucent:

However, with translucency, I'm getting this. The background view is white, which I understand will make this view a bit lighter:

Is there any way to achieve the original color while still having translucency? I've noticed Facebook has been able to get their bar to be their rich, blue color, as displayed here:

..so I know there has to be some way. Background views obviously make a difference here, but most of their content is also gray/white. It seems that regardless of whatever bar tint color you put in, you are unable to get vivid colors under translucency.

Updated with solution.

Here's the solution that I ended up coming up with. I took aprato's solution and then encompassed the custom UINavigationBar within a UINavigationController subclass. I have created a repository that has this implementation listed below, along with an example app.

////////////////////////////
// CRNavigationBar.m
////////////////////////////

#import "CRNavigationBar.h"

@interface CRNavigationBar ()
@property (nonatomic, strong) CALayer *colorLayer;
@end

@implementation CRNavigationBar

static CGFloat const kDefaultColorLayerOpacity = 0.5f;
static CGFloat const kSpaceToCoverStatusBars = 20.0f;

- (void)setBarTintColor:(UIColor *)barTintColor {
    [super setBarTintColor:barTintColor];
    if (self.colorLayer == nil) {
        self.colorLayer = [CALayer layer];
        self.colorLayer.opacity = kDefaultColorLayerOpacity;
        [self.layer addSublayer:self.colorLayer];
    }
    self.colorLayer.backgroundColor = barTintColor.CGColor;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    if (self.colorLayer != nil) {
        self.colorLayer.frame = CGRectMake(0, 0 - kSpaceToCoverStatusBars, CGRectGetWidth(self.bounds), CGRectGetHeight(self.bounds) + kSpaceToCoverStatusBars);

        [self.layer insertSublayer:self.colorLayer atIndex:1];
    }
}

@end

////////////////////////////
// CRNavigationController.m
////////////////////////////

#import "CRNavigationController.h"
#import "CRNavigationBar.h"

@interface CRNavigationController ()

@end

@implementation CRNavigationController

- (id)init {
    self = [super initWithNavigationBarClass:[CRNavigationBar class] toolbarClass:nil];
    if(self) {
        // Custom initialization here, if needed.    
    }
    return self;
}

- (id)initWithRootViewController:(UIViewController *)rootViewController {
    self = [super initWithNavigationBarClass:[CRNavigationBar class] toolbarClass:nil];
    if(self) {
        self.viewControllers = @[rootViewController];
    }

    return self;
}

@end

How to programmatically get iOS status bar height

I know that currently the status bar (with the time, battery, and network connection) at the top of the iPhone/iPad is 20 pixels for non-retina screens and 40 pixels for retina screens, but to future proof my app I would like to be able to determine this without hard coding values. Is it possible to figure out the height of the status bar programmatically?

How can I delay a method call for 1 second?

Is there an easy way delay a method call for 1 second?

I have a UIImageView that reacts on a touch event. When the touch is detected, some animations happen in the app. After one second, I want to call another method. In this case, I can't use the animationDidStop selector.

How do I size a UITextView to its content?

Is there a good way to adjust the size of a UITextView to conform to its content? Say for instance I have a UITextView that contains one line of text:

"Hello world"

I then add another line of text:

"Goodbye world"

Is there a good way in Cocoa Touch to get the rect that will hold all of the lines in the text view so that I can adjust the parent view accordingly?

As another example, look at the Notes field for events in the Calendar application--note how the cell (and the UITextView it contains) expands to hold all lines of text in the notes string.

iphone, dismiss keyboard when touching outside of UITextField

I'm wondering how to make the keyboard disappear when the user touches outside of the UITextField?

How to lose margin/padding in UITextView?

I have a UITextView in my iOS Application, which displays a large amount of text. I am then paging this text by using the offset margin parameter of the UITextView. My problem is that the padding of the UITextView is confusing my calculations as it seems to be different depending on the font size and typeface that I use.

Therefore, I pose the question: Is it possible to remove the padding surrounding the content of the UITextView?

Look forward to hearing your responses!

How to get the screen width and height in iOS?

How can one get the dimensions of the screen in iOS?

Currently, I use:

lCurrentWidth = self.view.frame.size.width;
lCurrentHeight = self.view.frame.size.height;

in viewWillAppear: and willAnimateRotationToInterfaceOrientation:duration:

The first time I get the entire screen size. The second time i get the screen minus the nav bar.

How do I inspect the view hierarchy in iOS?

Is there a GUI tool that inspects the view hierarchy of an iOS app? I'm thinking about Webkit's web inspector or similar tools. I'm looking to debug layout issues, like views having the wrong position or size, or a child not being properly contained in its parent. Currently I have to add asserts that test these various conditions by hand, or set different background colors on different views, and as you can imagine, that's a really tedious way to go about it.

I looked at Instruments's UI recorder, but that only records and plays back UI actions and, in any case, works only for Mac apps.

Is there a better solution?

How to change Navigation Bar color in iOS 7?

How do I change the Navigation Bar color in iOS 7?

Basically I want to achieve something like the Twitter Nav Bar (updated Twitter for iOS7 that is). I embedded-in a nav bar atop a view controller. All I want is to change the nav bar color to light blue along with the utility bar at the top. I can't seem to find an option in my storyboard.

What's the point of NSAssert, actually?

I have to ask this, because: The only thing I recognize is, that if the assertion fails, the app crashes. Is that the reason why to use NSAssert? Or what else is the benefit of it? And is it right to put an NSAssert just above any assumption I make in code, like a function that should never receive a -1 as param but may a -0.9 or -1.1?

Using HTML and Local Images Within UIWebView

I have a UIWebView in my app which I want to use to display an image which will link to another url.

I'm using

<img src="image.jpg" /> to load the image.

The problem is that the image doesn't load (ie. it can't be found) even though it's added as a resource in my project and is copied into the bundle.

I've tried using NSBundle to get the full path of the image and using that and it still doesn't show up in the web view.

Any ideas?

UITableViewCell, show delete button on swipe

How do I get the delete button to show when swiping on a UITableViewCell?

I have followed this post, but the event is never raised and the delete button never appears!

How can I add CGPoint objects to an NSArray the easy way?

I have about 50 CGPoint objects that describe something like a "path", and I want to add them to an NSArray. It's going to be a method that will just return the corresponding CGPoint for an given index. I don't want to create 50 variables like p1 = ...; p2 = ..., and so on. Is there an easy way that would let me to define those points "instantly" when initializing the NSArray with objects?