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This article mainly introduces how to use UIAlertView in iOS. It is very detailed and has a certain reference value. Friends who are interested must finish it!

NS_CLASS_DEPRECATED_IOS (2: 0, 9: 0, "UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead") _ _ TVOS_PROHIBITED

It probably means that after 9, it was still UIAlertView before using UIAlertController instead of UIAlertView,9.

Double version = [[UIDevice currentDevice] .systemVersion doubleValue]; / / determine the system version.

If (version > = 9.0f) {

UIAlertController * alertController = [UIAlertController alertControllerWithTitle:@ "prompt" message:nil preferredStyle:UIAlertControllerStyleAlert]

[alertController addAction: [UIAlertAction actionWithTitle:@ "OK" style:UIAlertActionStyleDefault handler: ^ (UIAlertAction * _ Nonnull action) {

NSLog (@ "OK")

}]]

[alertController addAction: [UIAlertAction actionWithTitle:@ "cancel" style:UIAlertActionStyleDefault handler: ^ (UIAlertAction * _ Nonnull action) {

NSLog (@ "cancel")

}]]

[self presentViewController:alertController animated:YES completion:nil]

} else {

UIAlertView * alertView = [[UIAlertView alloc] initWithTitle:@ "prompt" message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:@ "OK, @" cancel ", nil]

[alertView show]

}

# pragma mark UIAlertView Click event

-(void) alertView: (UIAlertView *) alertView clickedButtonAtIndex: (NSInteger) buttonIndex NS_DEPRECATED_IOS (2: 0, 9: 0) {

NSLog (@ "% @", @ (buttonIndex))

}

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