iOS7 related changes and fixes

iOS 7 New Design Guidelines

Every app needs an app icon and a launch image. In addition, some apps need custom icons to represent app-specific content, functions, or modes in navigation bars, toolbars, and tab bars.

Unlike other custom artwork in your app, the icons and images listed in Table 38-1 must meet specific criteria so that iOS can display them properly. In addition, some icon and image files have naming requirements. (If you need to support standard-resolution iPhone or iPod touch devices, divide by 2 the high-resolution sizes listed below.)

Table 38-1Size (in pixels) of custom icons and images

Description	Size for iPhone 5 and iPod touch (high resolution)	Size for iPhone and iPod touch (high resolution)	Size for iPad (high resolution)	Size for iPad 2 and iPad mini (standard resolution)
App icon (required for all apps)	120 x 120	120 x 120	152 x 152	76 x 76
App icon for the App Store (required for all apps)	1024 x 1024	1024 x 1024	1024 x 1024	1024 x 1024
Launch image (required for all apps)	640 x 1136	640 x 960	1536 x 2048 (portrait) 2048 x 1536 (landscape)	768 x 1024 (portrait) 1024 x 768 (landscape)
Spotlight search results icon (recommended)	80 x 80	80 x 80	80 x 80	40 x 40
Settings icon (recommended)	58 x 58	58 x 58	58 x 58	29 x 29
Toolbar and navigation bar icon (optional)	About 44 x 44	About 44 x 44	About 44 x 44	About 22 x 22
Tab bar icon (optional)	About 50 x 50 (maximum: 96 x 64)	About 50 x 50 (maximum: 96 x 64)	About 50 x 50 (maximum: 96 x 64)	About 25 x 25 (maximum: 48 x 32)
Default Newsstand cover icon for the App Store (required for Newsstand apps)	At least 512 pixels on the longest edge	At least 512 pixels on the longest edge	At least 512 pixels on the longest edge	At least 256 pixels on the longest edge
Web clip icon (recommended for web apps and websites)	120 x 120	120 x 120	152 x 152	76 x 76

For all images and icons, the PNG format is recommended. You should avoid using interlaced PNGs.

The standard bit depth for icons and images is 24 bits—that is, 8 bits each for red, green, and blue—plus an 8-bit alpha channel.

You don’t need to constrain your palette to web-safe colors.

Link :
https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html#//apple_ref/doc/uid/TP40006556-CH27-SW1

Problem :
How to disable back swipe gesture for UINavigationControl UINavigationBar in iOS7

Solution :
Here is the code

if ([self respondsToSelector:@selector(edgesForExtendedLayout)])
        self.edgesForExtendedLayout = UIRectEdgeNone;

self.navigationController.interactivePopGestureRecognizer.enabled = NO;

1:   #pragma mark  

2:  #pragma mark Hide / Show TabBar  
3:  - (void) hideNavBar {  
4:    UINavigationBar *navBar = self.navigationController.navigationBar;  
5:    navBar.hidden = TRUE;  
6:    
 if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {  
     DLog(@"< iOS6");  
     // Load resources for iOS 6.1 or earlier  
   } else {  
     DLog(@"iOS 7");  
     self.navigationController.interactivePopGestureRecognizer.enabled = NO; // Load resources for iOS 7 or later  
   }   
 
7:  }  
8:  - (void) showNavBar {  
9:    UINavigationBar *navBar = self.navigationController.navigationBar;  
10:    navBar.hidden = FALSE;  
11:  }  
12:  #pragma mark  
13:  #pragma mark - View  
14:  - (void)viewDidLoad {  
15:    [super viewDidLoad];  
16:    [self hideNavBar];  
17:  }  

http://stackoverflow.com/questions/17209468/how-to-disable-back-swipe-gesture-in-uinavigationcontroller-on-ios-7

Things Every App Must Do

• Update the app icon.
  In iOS 7, app icons for high-resolution iPhone and iPod touch are 120 x 120 pixels; for high-resolution iPad, app icons are 152 x 152 pixels. (To learn more about all icon sizes, see “Icon and Image Sizes”.)
  Note that iOS 7 doesn’t apply shine or a drop shadow to the app icon. And, although iOS 7 still applies a mask that rounds the corners of an app icon, it uses a different corner radius than earlier versions of iOS.
• Update the launch image to include the status bar area if it doesn’t already do so.
• Support Retina display and iPhone 5 in all your artwork and designs, if you’re not already doing so.

Things Every App Should Do

• Make sure that app content is discernible through translucent UI elements—such as bars and keyboards—and the transparent status bar. In iOS 7, view controllers use full-screen layout (to learn more, see Using View Controllers).
• Redesign custom bar button icons. In iOS 7, bar button icons are lighter in weight and have a different style. For some design guidance, see “Bar Button Icons”.
• Prepare for borderless buttons by reassessing the utility of button background images and bezels in your layout.
• Examine your app for hard-coded UI values—such as sizes and positions—and replace them with those you derive dynamically from system-provided values. Use Auto Layout to help your app respond when layout changes are required. (If you’re new to Auto Layout, learn about it by readingAuto Layout Guide.)
• Examine your app for places where the metrics and style changes of UIKit controls and views affect the layout and appearance. For example, switches are wider, grouped tables are no longer inset, and progress views are thinner. For more information on specific UI elements, see Bars and Bar Buttons,Content Views, Controls, and Temporary Views.
• Adopt Dynamic Type. In iOS 7, users can adjust the text size they see in apps. When you adopt Dynamic Type, you get text that responds appropriately to user-specified size changes. For more information, see Using Fonts.
• Expect users to swipe up from the bottom of the screen to reveal Control Center. If iOS determines that a touch that begins at the bottom of the screen should reveal Control Center, it doesn’t deliver the gesture to the currently running app. If iOS determines that the touch should not reveal Control Center, the touch may be slightly delayed before it reaches the app.
• Revisit the use of drop shadows, gradients, and bezels. Because the iOS 7 aesthetic is smooth and layered—with much less emphasis on using visual effects to make UI elements look physical—you may want to rethink these effects.
• If necessary, update your app to best practices for iOS 6—such as Auto Layout and storyboards—and ensure that the app doesn’t use deprecated APIs.

Now that you have a better idea of the types of things you need to do, learn more about changes in view controllers, tinting, and fonts by reading Appearance and Behavior.

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