UIAlertView文字居左,UILabel内边距设置

最近在项目中，需要有个强制更新功能，更新内容，动态显示，系统的content设置，内容是居中，丑爆了！！所以自定义个UILabel，因为需要有内边距！

UILabel不像UIButton那样，有个contentEdgeInsets、titleEdgeInsets、imageEdgeInsets供我们设置文字或图片与按钮边界的界限，所以我们只能另外想其他办法来实现。其实，办法也很简单，只需要我们自定义UILabel，然后重写drawTextInRect:方法即可实现我们的目标。

如下图

UIAlertView文字居左,UILabel内边距设置

 UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"发现新版本"
                                                                   message:nil
                                                                  delegate:self
                                                         cancelButtonTitle:nil
                                                         otherButtonTitles:@"立即更新", nil];
                    alert.tag = 3;
                    DGLabel *textLabel = [[DGLabel alloc] init];
                    textLabel.font = [UIFont systemFontOfSize:13];
                    textLabel.numberOfLines =0;
                    textLabel.textAlignment =NSTextAlignmentLeft;
                    textLabel.textInsets = UIEdgeInsetsMake(0.f, 10.f, 0.f, 10.f); // 设置左内边距
                    textLabel.text = responseObject[@"content"];
                    [alert setValue:textLabel forKey:@"accessoryView"];
                    [alert show];

DGLabel.h

#import <UIKit/UIKit.h>

@interface DGLabel : UILabel

@property (nonatomic, assign) UIEdgeInsets textInsets; // 控制字体与控件边界的间隙

@end

DGLabel.m

#import "DGLabel.h"

@implementation DGLabel

- (instancetype)init {
    if (self = [super init]) {
        _textInsets = UIEdgeInsetsZero;
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        _textInsets = UIEdgeInsetsZero;
    }
    return self;
}

- (void)drawTextInRect:(CGRect)rect {
    [super drawTextInRect:UIEdgeInsetsInsetRect(rect, _textInsets)];
}

@end