Method One：

 NSArray*viewArray=[[[[[[[[[[[[alertController view]subviews]firstObject]subviews]firstObject]subviews]firstObject]subviews]firstObject]subviews]firstObject]subviews];UILabel*alertTitle=viewArray[0]UILabel*alertMessage=viewArray[1];alertMessage.textAlignment=NSTextAlignmentLeft;

MethodOne.png

Method Two：

#import"UIAlertController+CustomAlertController.h"

@implementationUIAlertController (CustomAlertController)

@dynamictitleLabel;

@dynamicmessageLabel;

- (NSArray*)viewArray:(UIView*)root {

    NSLog(@"%@", root.subviews);

    staticNSArray*_subviews =nil;

    _subviews =nil;

    for(UIView*vinroot.subviews) {

      if(_subviews) {

      break;

      }

    if([visKindOfClass:[UILabelclass]]) {

    _subviews = root.subviews;

    return_subviews;

  }

    [selfviewArray:v];

  }

  return_subviews;

}

- (UILabel*)titleLabel {

    return[selfviewArray:self.view][0];

}

- (UILabel*)messageLabel {

    return[selfviewArray:self.view][1];

}

@end