How to execute a block of code in IOS7 not in IOS6

问题:

Hi In past I had developed one application which supports IOS6.Now the time came to support the same app for IOS7 also. For supporting the app for IOS6 & IOS7 I increased the Y value of each and every component by 20 pixels.

Here I am getting the OS version by using[[[UIDevice CurrentDevice]SystemVersion] floatvalue]; method.Based on that OS version I am changing the rect values for each and every component.

For handling the StatusbarStyle I am using the following methods in IOS7

 1. [self setNeedsStatusBarAppearanceUpdate];
 2.-(UIStatusBarStyle)preferredStatusBarStyle;

These methods are working fine in IOS7, But if I install the app in IOS6 the app is crashing due to the above two methods.

So now my requirement is I have to hide or not execute IOS7 related methods or changes in IOS6 Device.With the help of this Implementation I hope I can resolve the issue.

Even I used few methods to resolve this crash issue.The methods which I used are

1. #if __IPHONE_OS_VERSION_MAX_ALLOWED== 70000
2.#if __IPHONE_OS_VERSION_MIN_REQUIRED==70000

Here while creating the ipa file deployment Target Which I had set is 6.0. Because I have to support IOS6 & IOS7.

So please help me to resolve this issue. Thanks in Advance.

回答1:

use NSFoundationVersionNumber condition for doing this Supporting iOS 6

If you need to load different resources for different app versions—and you currently identify a storyboard or XIB file in your Info.plist file—

you can use the version of the Foundation framework to determine the current system version and load the appropriate resource in application:didFinishLaunchingWithOptions:. The code below shows how to check the Foundation framework version:

 if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {

    // Load resources for iOS 6.1 or earlier

    } else {

    // Load resources for iOS 7 or later

    }

Take a look the best answer of the same thing that you want

iOS 7 status bar back to iOS 6 default style in iPhone app?

回答2:

Try checking for this condition :

if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
    // iOS 7
} else {
    // iOS 6
}