On iOS8, Displaying My App in Landscape Mode Will Hide the Status Bar But on iOS 7 the Status Bar Is Displayed on Both Orientations

On iOS8, displaying my app in landscape mode will hide the status bar but on iOS 7 the status bar is displayed on both orientations

Try this

Add below code in didRotateFromInterfaceOrientation

[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

EDIT
NO NEED TO WRITE CODE IN ALL VIEW CONTROLLER
Set View controller-based status bar appearance to NO in plist and add below code in
root view controller's viewDidLoad

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

Demo project
https://www.dropbox.com/s/uumneidk4wom5md/demoStatusBar.zip?dl=0

On iOS8, displaying my app in landscape mode will hide the status bar but on iOS 7 the status bar is displayed on both orientations

Try this

Add below code in didRotateFromInterfaceOrientation

[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

EDIT
NO NEED TO WRITE CODE IN ALL VIEW CONTROLLER
Set View controller-based status bar appearance to NO in plist and add below code in
root view controller's viewDidLoad

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

Demo project
https://www.dropbox.com/s/uumneidk4wom5md/demoStatusBar.zip?dl=0

Issue of status bar which is getting hidden in landscape mode in ios 8 and works fine in ios 7 tried after release of ios 8 in xCode 6

This is the new default in iOS 8. But you can restore the old behavior by overriding the following in your UIViewController:

- (BOOL)prefersStatusBarHidden {
    return NO;
}

Xcode 6.x/iOS 8 Hides Status Bar in Landscape Orientation

Best possible solution

It's basically a two step process:

1). Set "View controller-based status bar appearance" to NO, in your project's Info.plist file.

2). Force the status bar hidden status to NO, in application:didFinishLaunchingWithOptions:, using the following code:

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

And, voila!

Note: It's important to use both the setStatusBarHidden:withAnimation: statements above, to force the status bar hidden state.

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Reference: On iOS8, displaying my app in landscape mode will hide the status bar but on iOS 7 the status bar is displayed on both orientations

Status bar behave weird in landscape mode on iOS 8.1 and work fine with iOS 7.1

This may help you

In Plist set View controller-based status bar appearance: NO

and add the code in your view Controller

-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
}

Display status bar on landscape orientation for iOS 8

I'm not sure if this is the right answer. Yet this one works but there's a glitch on iPhone6/iPhone6Plus, it doesn't get displayed upon application start.

[application setStatusBarHidden: NO];

Button not appearing in landscape mode in iOS 8

Here is a screen which show constraint needed to show button in centre in both landscape and portrait mdoe

This is a simplest thing i ever post in stackoverflow

Please check your code again and see is there any other constrains you had apply.

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Note : In iOS8 status bar is hide in landscape mode and if you want to display it in landscape mode please follow my answer over here link.

Status bar and navigation bar issue in IOS7

Fix for status bar issue in IOS 7

Finally I fixed the status bar over lap issue using the delta value property in xcode5. First I have increased origin - y 20pxl to all the controller used in the Xib (it seams to be working fine only in IOS 7), after that I set the delta value for all the view controller origin -y to -20 it works fine in both iOS 6 and iOS 7.

Steps to do that.

Xcode 5 provide preview option to view the appearance of the xib in different view based on the OS version.

Choose preview option from assistant editor

Click assistant editor

and choose preview option to preview selected view controller in different version.

view controller view preview option.

in preview you can find the toggle option to preview view in different version. In preview u can feel the status bar issue clearly if its not fixed properly by toggle the version.

Three steps to fix the status bar issue:
step 1: Make sure the view target us 7.0 and later in File inspector.

Step 2 : Increase the origin - y with 20 pixel (exactly the size of the status bar) for all the controls added in the view controller.

Step 3 : Set the delta value of origin y to -20 for all the controls then only it will adjust automatically based on the version. Use preview now and feel the differ that the controls automatically adjust because of the delta value.

Once the status bar issue fixed, issue while presenting the model view (ZbarSDk controller) is also fixed automatically.

Preview screen :

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