这篇文章主要介绍了iOS中如何实现Label全方位对齐,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
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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 /** * 根据对齐方式进行文本对齐 * * @param alignType 对齐block */ - (void)textAlign:(void(^)(ARMaker *make))alignType; @end //工具类 @interface ARMaker : NSObject /* 存放对齐样式 */ @property(nonatomic, strong) NSMutableArray *typeArray; /** * 添加对齐样式 */ - (ARMaker *(^)(textAlignType type))addAlignType; @end
ARAlignLabel.m
#import "ARAlignLabel.h" @interface ARAlignLabel () /* 对齐方式 */ @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:
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