ios9 UIAlertController的UITextField太小

我使用此代碼顯示UIAlert這會問簡單的輸入ios9 UIAlertController的UITextField太小

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Alert" message:@"Message" preferredStyle:UIAlertControllerStyleAlert]; 
[alert addAction:[UIAlertAction actionWithTitle:@"Click" style:UIAlertActionStyleDefault handler:nil]]; 
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) { 
    textField.placeholder = @"Enter text:"; 
}]; 
[self presentViewController:alert animated:YES completion:nil];

也試過的iOS 7的這個代碼

UIAlertView *alertViewCustomQuestion=[[UIAlertView alloc]initWithTitle:@"Custom Question" message:@"Please enter your custom question!" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok",nil]; 
alertViewCustomQuestion.alertViewStyle=UIAlertViewStylePlainTextInput; 
[alertViewCustomQuestion show];

兩個顯示同樣的結果。雖然我看到的任何示例都有很好的寬度。