iOS开发实战之Label全方位对齐的轻松实现

前言

本文主要给大家介绍了关于iOS Label全方位对齐的实现方法，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧

ARUILabelTextAlign

1. 实现 UILabel文本在 左(上 中 下)、中(上 中 下）、右(上 中 下) 9个方位显示；

2. 提供富文本底部不对齐的解决方案；

演示

核心代码：

ARAlignLabel.h

#import 
@class ARMaker;

typedef NS_ENUM(NSUInteger, textAlignType)
{
 textAlignType_top = 10, // 顶部对齐
 textAlignType_left,  // 左边对齐
 textAlignType_bottom,  // 底部对齐
 textAlignType_right,  // 右边对齐
 textAlignType_center  // 水平/垂直对齐（默认中心对齐）
};

@interface ARAlignLabel : UILabel


- (void)textAlign:(void(^)(ARMaker *make))alignType;

@end


//工具类
@interface ARMaker : NSObject


@property(nonatomic, strong) NSMutableArray *typeArray;


- (ARMaker *(^)(textAlignType type))addAlignType;

@end

ARAlignLabel.m

#import "ARAlignLabel.h"

@interface ARAlignLabel ()


@property(nonatomic, strong) NSArray *typeArray;
//上
@property(nonatomic, assign) BOOL hasTop;
//左
@property(nonatomic, assign) BOOL hasLeft;
//下
@property(nonatomic, assign) BOOL hasBottom;
//右
@property(nonatomic, assign) BOOL hasRight;

@end

@implementation ARAlignLabel

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {
 CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];
 if (self.typeArray){
  for (int i=0; i

工具使用 - 九个方位对齐



- (void)viewDidLoad {
 [super viewDidLoad];
 self.view.backgroundColor = [UIColor whiteColor];
 
 if (_index == 9) {
  //富文本底部对齐
  [self attributedTextAgainOfBottom];
 }else {
  ARAlignLabel *label = [[ARAlignLabel alloc] initWithframe:CGRectMake(kScreenWidth/2.0 - 150, 300, 300, 80)];
  label.backgroundColor = [UIColor orangeColor];
  label.textColor = [UIColor blackColor];
  label.font = [UIFont systemFontOfSize:18];
  label.text = @"爱学习，爱编程，爱咖啡可乐";
  label.numberOfLines = 1;
  [self.view addSubview:label];
  
  switch (_index) {
   case 0:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_left).addAlignType(textAlignType_top);
    }];
    break;
   case 1:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_left).addAlignType(textAlignType_center);
    }];
    break;
   case 2:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_left).addAlignType(textAlignType_bottom);
    }];
    break;
   case 3:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_center).addAlignType(textAlignType_top);
    }];
    break;
   case 4:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_center);
    }];
    break;
   case 5:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_center).addAlignType(textAlignType_bottom);
    }];
    break;
   case 6:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_right).addAlignType(textAlignType_top);
    }];
    break;
   case 7:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_right).addAlignType(textAlignType_center);
    }];
    break;
   case 8:
    [label textAlign:^(ARMaker *make) {
     make.addAlignType(textAlignType_right).addAlignType(textAlignType_bottom);
    }];
    break;
   default:
    break;
  }
 }
}

富文本底部对齐



//富文本底部对齐
- (void)attributedTextAgainOfBottom {
 
 CGFloat space = 10.0;
 
 ARAlignLabel *leftLB = [[ARAlignLabel alloc] initWithframe:CGRectMake(20, 200, kScreenWidth/2.0 - 20 - space/2.0, 80)];
 leftLB.backgroundColor = [UIColor lightGrayColor];
 leftLB.textColor = [UIColor blackColor];
 leftLB.numberOfLines = 1;
 [self.view addSubview:leftLB];
 //右下
 [leftLB textAlign:^(ARMaker *make) {
  make.addAlignType(textAlignType_center);
 }];
 
 NSMutableAttributedString *attributedArr = [[NSMutableAttributedString alloc] initWithString:@"单价 $123"];
 [attributedArr setAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:40], NSForegroundColorAttributeName:[UIColor blackColor]} range:NSMakeRange(0, 1)];
 [attributedArr setAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:25], NSForegroundColorAttributeName:[UIColor blackColor]} range:NSMakeRange(1, 1)];
 [attributedArr setAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20], NSForegroundColorAttributeName:[UIColor blueColor]} range:NSMakeRange(3, 1)];
 [attributedArr setAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:35], NSForegroundColorAttributeName:[UIColor redColor]} range:NSMakeRange(4, attributedArr.length - 4)];
 
 leftLB.attributedText = attributedArr;
 
 
 //对齐之后
 ARAlignLabel *rightLB = [[ARAlignLabel alloc] initWithframe:CGRectMake(kScreenWidth/2.0 + space/2.0, 200, leftLB.frame.size.width, 80)];
 rightLB.backgroundColor = [UIColor lightGrayColor];
 rightLB.textColor = [UIColor blackColor];
 rightLB.numberOfLines = 1;
 [self.view addSubview:rightLB];
 //左下
 [rightLB textAlign:^(ARMaker *make) {
  make.addAlignType(textAlignType_center);
 }];
 
 //设置部分文字的偏移量 (0是让文字保持原来的位置, 负值是让文字下移，正值是让文字上移)
 [attributedArr addAttribute:NSbaselineOffsetAttributeName value:@(1) range:NSMakeRange(0, 1)];
 [attributedArr addAttribute:NSbaselineOffsetAttributeName value:@(0) range:NSMakeRange(1, 1)];
 [attributedArr addAttribute:NSbaselineOffsetAttributeName value:@(-2) range:NSMakeRange(3, 1)];
 [attributedArr addAttribute:NSbaselineOffsetAttributeName value:@(-3) range:NSMakeRange(4, attributedArr.length - 4)];
 
 rightLB.attributedText = attributedArr;
 
}

富文本底部对齐 - 使用场景：



Github：https://github.com/ArchLL/ARUILabelTextAlign （本地下载）
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对考高分网的支持。