iOS 修改 UIAlertController 内部文本对齐方

实现AlertController内文本任意对其方式.

给UIAlertController添加分类

.h文件

@interface UIAlertController (YFAdd)
/**
    alertController title
 */
@property (nonatomic, strong) UILabel *yf_titleLabel;

/**
    alertController message
 */
@property (nonatomic, strong) UILabel *yf_messageLabel;

@end

.m文件

@implementation UIAlertController (YFAdd)
@dynamic yf_titleLabel;
@dynamic yf_messageLabel;

- (NSArray *)yf_viewArray:(UIView *)root {
    static NSArray *_subviews = nil;
    _subviews = nil;
    for (UIView *v in root.subviews) {
        if (_subviews) {
            break;
        }
        if ([v isKindOfClass:[UILabel class]]) {
            _subviews = root.subviews;
            return _subviews;
        }
        [self yf_viewArray:v];
    }
    return _subviews;
}

- (UILabel *)yf_titleLabel {
    return [self yf_viewArray:self.view][0];
}

- (UILabel *)yf_messageLabel {
    return [self yf_viewArray:self.view][1];
}
@end

用的时候

yourAlertController.yf_messageLabel.textAlignment = NSTextAlignmentLeft;