UIAlertController if iOS 8, otherwise UIAlertView

Question

I want to conform to the UIAlertController used in iOS 8 since UIAlertView is now deprecated. Is there a way that I can use this without breaking support for iOS 7? Is there

Answer 1

// Above ios 8.0
float os_version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (os_version >= 8.000000)
{
   　　　//Use UIAlertController    
}
else
{
     //UIAlertView
}

Answer 2

Create simple utility function to reduce code

CODE :

// pass minimum required iOS version
BOOL isOSSupported(NSString *minRequiredVersion)
{
    NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
    BOOL isOSSupported = ([currSysVer compare:minRequiredVersion options:NSNumericSearch] != NSOrderedAscending) && 
                                  ![currSysVer isEqualToString:@"Unknown"];
    return isOSSupported;
}

USE :

if(isOSSupported("8.0")
{
// Code for iOS8 and above
}
else
{
// Code for iOS7 and below
}

---

Or Use system constant NSFoundationVersionNumber_iOS_7_1 as below

if(floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1)
{
   // Code for iOS8 and above
}
else
{
   // Code for iOS7 and below
}

for more options Link

Answer 3

Objective C (as mentioned above)

if ([UIAlertController class]) {
    // use UIAlertController

} else {
    // use UIAlertView

}

Swift

if objc_getClass("UIAlertController") == nil  {
       // use UIAlertView 

} else {
  // use UIAlertController

}

Don't use if NSClassFromString("UIAlertController") == nil It is not working because the signature for this method is func NSClassFromString(_ aClassName: String!) -> AnyClass!

Answer 4

Try below code. It works fine for both iOS 8 and below version.

if (IS_OS_8_OR_LATER) {
UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:title message:msg preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *cancelAction = [UIAlertAction
                             actionWithTitle:@"OK"
                             style:UIAlertActionStyleCancel
                             handler:^(UIAlertAction *action)
                             {

                             }];
[alertVC addAction:cancelAction];

[[[[[UIApplication sharedApplication] windows] objectAtIndex:0] rootViewController] presentViewController:alertVC animated:YES completion:^{

}];
}
else{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:msg delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
    [alert show];
}

Answer 5

I have written one class that wrap the UIAlertView and use UIAlertController. For the programmer is transparently hence is sufficient import this classes in the project. The utility of this classes is when in a old project there are more UIAlertView to change. Link: https://github.com/kennymuse/UIAlertView