iOS：小警告⚠️'UIAlertView' is deprecated: first deprecated in iOS 9.0 - UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead

UIAlertView小警告

【“ 'UIAlertView' is deprecated: first deprecated in iOS 9.0 - UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead”】

【deprecated：过去的；反对】

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解决方法一：

UIAlertController是iOS8以后才出现的类，如果你的项目需要兼容iOS7，恐怕你不能使用这个类，否则会崩溃的。你要是觉得黄色的警告看着不爽，可以这样。

#pragma clang diagnostic push

#pragma clang diagnostic ignored"-Wdeprecated-declarations"

//这里是会报警告的代码

#pragma clang diagnostic pop

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解决方法、二

提示框

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"保存" message:@"保存文档吗" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *cancel  =[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];

UIAlertAction *sure  =[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];

[alertController addAction:cancel];

[alertController addAction:sure];

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