The answers from 2012 aren&#39;t incorrect, but some might find the explanation in the UIControl docs to be…anemic. I personally find this explanation from the [Collection View Programming Guide for iOS][1] to be more helpful:

&gt; There is a subtle but important distinction between a cell’s highlighted state and its selected state. The highlighted state is a transitional state that you can use to apply visible highlights to the cell while the user’s finger is still touching the device. This state is set to `YES` only while the collection view is tracking touch events over the cell. When touch events stop, the highlighted state returns to the value `NO`. By contrast, the selected state changes only after a series of touch events has ended—specifically, when those touch events indicated that the user tried to select the cell.
&gt;
&gt; […snip…]
&gt;
&gt; ![enter image description here][2]

Although this documentation is specifically for collection view cells, the explanation holds pretty well across the Cocoa Touch frameworks.

  [1]: https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/CollectionViewPGforIOS/CreatingCellsandViews/CreatingCellsandViews.html#//apple_ref/doc/uid/TP40012334-CH7-SW8
  [2]: http://i.stack.imgur.com/DDpb2.png

According to the [documentation](http://developer.apple.com/library/ios/#documentation/uikit/reference/UIControl_Class/Reference/Reference.html#//apple_ref/c/tdef/UIControlState):

_**Highlighted state** of a control. A control enters this state when a touch enters and exits during tracking and when there is a touch up event._

and

_**Selected state** of a control. For many controls, this state has no effect on behaviour or appearance. But other subclasses may have different appearance depending on their_ `selected` _state._

this is the pure difference between the states.

I&#39;m remote debugging a large app between DElphi XE2 (update #4) and a Windows XP target. PAServer is running on the target and the application works fine and stops at breakpoints (you would NOT believe how hard just that achievement was - hint - delete your DPROJ and start again if it has been through any IDE prior to XE).

I notice that the display of local variables and watches show my strings in a strange format compared to the usual display of the &#39;some string&#39; format that one sees when debugging locally. I see:

![enter image description here][1]

Can anyone tell me why the strings are displayed this way? I also get quite a bit of { NULL } and garbage between {}&#39;s on output variables that are not yet assigned.
Thanks.

&lt;Later edit&gt;. I see that this format indicates wide strings. I tried a simple app on Windows 7 and got the following result. My App at a breakpoint:

![enter image description here][2]

The displayed local string variables:

![enter image description here][3]

Note the truncated &#39;Hello&#39;. It would seem that XE2 has a problem with remote unicode strings at times. My PaServer is version 1.0.2. Can anyone check that this is the latest? &#39;Twas taken from Update #4...


  [1]: http://i.stack.imgur.com/kSq2Q.png
  [2]: http://i.stack.imgur.com/XyI23.png
  [3]: http://i.stack.imgur.com/q4FHB.png

Remote debugging with XE2 - display of strings

Although the title seems similar to previous questions, I could not find the solution to to my Simple case:

* I committed to my branch &#39;ABCD&#39; : `git commit -a   .....`
* Then decided to visit a previous commit so : `git checkout 2387687326487`
* Here I made some changes which was for testing purpose only, and I don&#39;t want to keep them
* I am done, I want to get back to my latest commit(again:ignoring changes whcih i made to the old commit) : the command `git checkout &#39;ABCD&#39;` gives error:

&gt; Your local changes to the following files will be overwritten by checkout....please commit or stash...


while I don&#39;t want to commit or stash or whatever. I just want to go back home :) what should I do please?


How to make GIT ignore my changes

Can anyone tell me What is the difference between Highlighted and Selected state of a `UIButton`? 

What is the difference between Highlighted and Selected UIButton&#39;s State?

<p>Can anyone tell me What is the difference between Highlighted and Selected state of a <code>UIButton</code>?</p>


Below is the error message I receive in the debug area. It runs fine and nothing is wrong except that I receive this error. Would this prevent apple accepting the app? How do I fix it?

    2012-07-26 01:58:18.621 Rolo[33597:11303] Unable to simultaneously satisfy constraints.
    	Probably at least one of the constraints in the following list is one you don&#39;t want. Try this: (1) look at each constraint and try to figure out which you don&#39;t expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you&#39;re seeing NSAutoresizingMaskLayoutConstraints that you don&#39;t understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
    (
        &quot;&lt;NSAutoresizingMaskLayoutConstraint:0x887d630 h=--&amp; v=--&amp; V:[UIButtonLabel:0x886ed80(19)]&gt;&quot;,
        &quot;&lt;NSAutoresizingMaskLayoutConstraint:0x887d5f0 h=--&amp; v=--&amp; UIButtonLabel:0x886ed80.midY == + 37.5&gt;&quot;,
        &quot;&lt;NSAutoresizingMaskLayoutConstraint:0x887b4b0 h=--&amp; v=--&amp; V:[UIButtonLabel:0x72bb9b0(19)]&gt;&quot;,
        &quot;&lt;NSAutoresizingMaskLayoutConstraint:0x887b470 h=--&amp; v=--&amp; UIButtonLabel:0x72bb9b0.midY == - 0.5&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72bf860 V:[UILabel:0x72bf7c0(17)]&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72c2430 UILabel:0x72bfad0.top == UILabel:0x72bf7c0.top&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72c2370 UILabel:0x72c0270.top == UILabel:0x72bfad0.top&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72c22b0 V:[UILabel:0x72bf7c0]-(NSSpace(8))-[UIButton:0x886efe0]&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72c15b0 V:[UILabel:0x72c0270]-(NSSpace(8))-[UIRoundedRectButton:0x72bbc10]&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72c1570 UIRoundedRectButton:0x72bbc10.baseline == UIRoundedRectButton:0x7571170.baseline&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0x72c21f0 UIRoundedRectButton:0x7571170.top == UIButton:0x886efe0.top&gt;&quot;
    )
    
    Will attempt to recover by breaking constraint 
    &lt;NSLayoutConstraint:0x72bf860 V:[UILabel:0x72bf7c0(17)]&gt;
    
    Break on objc_exception_throw to catch this in the debugger.
    The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in &lt;UIKit/UIView.h&gt; may also be helpful.



Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint

How can I access the Bundle Seed ID/Team ID/App Identifier Prefix string programmatically?  (These are all the same thing as far as I can tell).

I am using the UICKeychainStore keychain wrapper to persist data across several applications.  Each of these applications has a shared keychain access group in their entitlement plists, and share the same provisioning profile.  By default, the keychain services use the first access group in the plist as the access group to save data to.  This looks like &quot;AS234SDG.com.myCompany.SpecificApp&quot; when I debug UICKeychainStore.  I would like to set the access group to &quot;AS234SDG.com.myCompany.SharedStuff&quot;, but I can&#39;t seem to locate how to get the &quot;AS234SDG&quot; string of the access group programmatically, and would like to avoid hard-coding it if possible. 

Access App Identifier Prefix programmatically

I have an app that allows a user to record a video with `UIImagePickerController` and then upload it to YouTube. The problem is that the video file that `UIImagePickerController` creates is HUGE, even when the video is only 5 seconds long. For example, a 5 second long video is 16-20 megabytes. I want to keep the video in 540 or 720 quality, but I want to reduce the file size.

I&#39;ve been experimenting with AVFoundation and `AVAssetExportSession` to try to get a smaller file size. I&#39;ve tried the following code:

    AVAsset *video = [AVAsset assetWithURL:videoURL];
    AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:video presetName:AVAssetExportPresetPassthrough];
    exportSession.shouldOptimizeForNetworkUse = YES;
    exportSession.outputFileType = AVFileTypeMPEG4;
    exportSession.outputURL = [pathToSavedVideosDirectory URLByAppendingPathComponent:@&quot;vid1.mp4&quot;];
    [exportSession exportAsynchronouslyWithCompletionHandler:^{
        NSLog(@&quot;done processing video!&quot;);
    }];

But **this hasn&#39;t reduced the file size at all**. I know what I&#39;m doing is possible because in Apple&#39;s Photos app, when you select **&quot;share on YouTube&quot;**, will automatically process the video file so its small enough to upload. I want to do the same thing in my app. 

How can I accomplish this?

How can I reduce the file size of a video created with UIImagePickerController?

**My problem:** I have a superview `EditView` that takes up basically the entire application frame, and a subview `MenuView` which takes up only the bottom ~20%, and then `MenuView` contains its own subview `ButtonView` which actually resides outside of `MenuView`&#39;s bounds (something like this: `ButtonView.frame.origin.y = -100`).

(note: `EditView` has other subviews that are not part of `MenuView`&#39;s view hierarchy, but may affect the answer.)

You probably already know the issue: when `ButtonView` is within the bounds of `MenuView` (or, more specifically, when my touches are within `MenuView`&#39;s bounds), `ButtonView` responds to touch events. When my touches are outside of `MenuView`&#39;s bounds (but still within `ButtonView`&#39;s bounds), no touch event is received by `ButtonView`.

**Example:**

 - (E) is `EditView`, the parent of all views
 - (M) is `MenuView`, a subview of EditView
 - (B) is `ButtonView`, a subview of MenuView

**Diagram:** 

    +------------------------------+
    |E                             |
    |                              |
    |                              |
    |                              |
    |                              |
    |+-----+                       |
    ||B    |                       |
    |+-----+                       |
    |+----------------------------+|
    ||M                           ||
    ||                            ||
    |+----------------------------+|
    +------------------------------+

Because (B) is outside (M)&#39;s frame, a tap in the (B) region will never be sent to (M) - in fact, (M) never analyzes the touch in this case, and the touch is sent to the next object in the hierarchy.

**Goal:** I gather that overriding `hitTest:withEvent:` can solve this problem, but I don&#39;t understand exactly how. In my case, should `hitTest:withEvent:` be overridden in `EditView` (my &#39;master&#39; superview)? Or should it be overridden in `MenuView`, the direct superview of the button that is not receiving touches? Or am I thinking about this incorrectly?

If this requires a lengthy explanation, a good online resource would be helpful - except Apple&#39;s UIView docs, which have not made it clear to me.

Thanks!

Capturing touches on a subview outside the frame of its superview using hitTest:withEvent:

I&#39;m reading Xcode&#39;s documentation, and here is something that puzzles me:

    __block typeof(self) tmpSelf = self;
    [self methodThatTakesABlock:^ {
        [tmpSelf doSomething];
    }];

The following is copied from the documentation:

&gt; A block forms a strong reference to variables it captures. If you use
&gt; `self` within a block, the block forms a strong reference to `self`, so if
&gt; `self` also has a strong reference to the block (which it typically
&gt; does), a strong reference cycle results. To avoid the cycle, you need
&gt; to create a weak (or `__block`) reference to self outside the block, as
&gt; in the example above.

I don&#39;t understand what does &#39;a weak (or `__block`)&#39; mean?

Is

    __block typeof(self) tmpSelf = self;

and

    __weak typeof(self) tmpSelf = self;

exactly the same here？

I found another piece in the document:

&gt; Note: In a garbage-collected environment, if you apply both `__weak` and
&gt; `__block` modifiers to a variable, then the block will not ensure that it is kept alive.

So, I&#39;m totally puzzled.

What is the difference between a __weak and a __block reference?

I need a `UIButton` with **image &amp; text**. Image should be in the top &amp; text comes under the image both should be clickable.


UIButton Image + Text IOS

At some point in my app I have a highlighted `UIButton` (for example when a user has his finger on the button) and I need to change the background color while the button is highlighted (so while the finger of the user is still on the button).

I tried the following:

    _button.backgroundColor = [UIColor redColor];

But it is not working. The color remains the same. I tried the same piece of code when the button is not highlighted and it works fine. I also tried calling `-setNeedsDisplay` after changing the color, it didn&#39;t have any effect.

How to force the button to change the background color?

How to change the background color of a UIButton while it&#39;s highlighted?

I am trying to set cornerRadius of UIButton but I dont know how to do it.

If I do like this:

    button.layer.cornerRadius = 5;

works well, if I do like this :

    button.layer.cornerRadius = 5;
    [button setBackgroundColor:[UIColor colorWithPatternImage:radialGradient]];
the corners are not rounded.

I know I could solve this whit

     [button.layer setMasksToBounds:YES];
but I specifically looking for different solution, because I add some arrows to the button and if I set mask to bounds the arrow are masked.   

EDIT : 

radialGradient is made whit func
    
    + (UIImage *)getRadialGradientImage:(CGSize)size centre:(CGPoint)centre radius:(float)radius startColor:(UIColor *)startColor endColor:(UIColor *)endColor{
    
    // Initialise
    UIGraphicsBeginImageContextWithOptions(size, YES, 1);
    
    // Create the gradient&#39;s colours
    size_t num_locations = 2;
    CGFloat locations[2] = { 0.0, 1.0 };
    
    const CGFloat *component_first = CGColorGetComponents([startColor CGColor]);
    
    CGFloat red1 = component_first[0];
    CGFloat green1 = component_first[1];
    CGFloat blue1 = component_first[2];
    
    const CGFloat *component_second = CGColorGetComponents([endColor CGColor]);
    CGFloat red2 = component_second[0];
    CGFloat green2 = component_second[1];
    CGFloat blue2 = component_second[2];
    
    const CGFloat components[8] = { red1,green1,blue1,1,red2,green2,blue2,1}; // End color
    
    CGColorSpaceRef myColorspace = CGColorSpaceCreateDeviceRGB();
    CGGradientRef myGradient = CGGradientCreateWithColorComponents (myColorspace, components, locations, num_locations);
    
    // Normalise the 0-1 ranged inputs to the width of the image
    CGPoint myCentrePoint = CGPointMake(centre.x * size.width, centre.y * size.height);
    float myRadius = MIN(size.width, size.height) * radius;
    
    // Draw it!
    CGContextDrawRadialGradient (UIGraphicsGetCurrentContext(), myGradient, myCentrePoint,
                                 0, myCentrePoint, myRadius,
                                 kCGGradientDrawsAfterEndLocation);
    
    // Grab it as an autoreleased image
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    // Clean up
    CGColorSpaceRelease(myColorspace); // Necessary?
    CGGradientRelease(myGradient); // Necessary?
    UIGraphicsEndImageContext(); // Clean up
    return image;
    }

set cornerRadius and setbackgroundimage to UIButton

I have a UIView, in which I have arranged UIButtons. I want to find the positions of those UIButtons. 

I am aware that `buttons.frame` will give me the positions, but it will give me positions only with respect to its immediate superview. 

Is there is any way we can find the positions of those buttons, withe respect to UIButtons superview&#39;s superview? 

For instance, suppose there is UIView named &quot;firstView&quot;.

Then, I have another UIView, &quot;secondView&quot;. This &quot;SecondView&quot; is a subview of &quot;firstView&quot;. 

Then I have UIButton as a subview on the &quot;secondView&quot;. 

    -&gt;UIViewController.view
    ---&gt;FirstView A
    -------&gt;SecondView B
    ------------&gt;Button

Now, is there any way we can find the position of that UIButton, with respect to &quot;firstView&quot;?


Get position of UIView in respect to its superview&#39;s superview

I&#39;m using **iOS 6**, so attributed strings should be easy to use, right? Well... not so much.

What I want to do:

Using a custom subclass of `UIButton` (it doesn&#39;t do anything custom to `titleLabel`), I&#39;d like to have a multi-line, attributed title that is:

1. All caps (I realize that&#39;s not part of the attributes) on the first line
2. **Bolded** on the first line
3. **Underlined** on the first line
4. &quot;Normal&quot; weight on the second line
5. Non-underlined on the second line
6. Centered on both lines

I&#39;ve been able to get #&#39;s 1 through 5 so far (at least, I thought I did, but current testing is yielding errors with multi-line text), but when I tried to do something (anything!) to get the text to be centered, my app keeps crashing. When I try to get all 6 items working (through various methods), I get the following crash/error:

    Terminating app due to uncaught exception 
    &#39;NSInternalInconsistencyException&#39;, reason: 
    &#39;NSAttributedString invalid for autoresizing, 
    it must have a single spanning paragraph style
    (or none) with a non-wrapping lineBreakMode.&#39;

Based on what I&#39;ve tried, it appears that I can have one of the following options, but not both:

1. A multi-line, centered label
2. An attributed label

I can live with one or the other if I **must**, but I can&#39;t believe that I can&#39;t have what seems to be a fairly straightforward concept.

Can someone please tell me what I&#39;ve got wrong?

Here&#39;s the last iteration of the code I&#39;m trying:

    NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
    [style setAlignment:NSTextAlignmentCenter];
    [style setLineBreakMode:NSLineBreakByWordWrapping];
    
    UIFont *font1 = [UIFont fontWithName:@&quot;HelveticaNeue-Medium&quot; size:20.0f];
    UIFont *font2 = [UIFont fontWithName:@&quot;HelveticaNeue-Light&quot;  size:20.0f];
    NSDictionary *dict1 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),  
                            NSFontAttributeName:font1};
    NSDictionary *dict2 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleNone),    
                            NSFontAttributeName:font2};
    
    NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] init];
    [attString appendAttributedString:[[NSAttributedString alloc] initWithString:@&quot;LINE 1\n&quot;    attributes:dict1]];
    [attString appendAttributedString:[[NSAttributedString alloc] initWithString:@&quot;line 2&quot;      attributes:dict2]];
    [[self buttonToStyle] setAttributedTitle:attString forState:UIControlStateNormal];
    [[[self buttonToStyle] titleLabel] setNumberOfLines:0];
    [[[self buttonToStyle] titleLabel] setLineBreakMode:NSLineBreakByWordWrapping];

Content Type	Original Author	Original Content on Stackoverflow
Question	Jamal Zafar	View Question on Stackoverflow
Solution 1 - Objective C	clozach	View Answer on Stackoverflow
Solution 2 - Objective C	holex	View Answer on Stackoverflow

What is the difference between Highlighted and Selected UIButton's State?

Objective C Problem Overview

Objective C Solutions

Solution 1 - Objective C

Solution 2 - Objective C

How to make GIT ignore my changes

Remote debugging with XE2 - display of strings

Attributions