前言
本文主要給大家介紹了關(guān)于iOS Label全方位對齊的實(shí)現(xiàn)方法，分享出來供大家參考學(xué)習(xí)，下面話不多說了，來一起看看詳細(xì)的介紹吧
ARUILabelTextAlign
1. 實(shí)現(xiàn) UILabel文本在 左(上 中 下)、中(上 中 下）、右(上 中 下) 9個(gè)方位顯示；
2. 提供富文本底部不對齊的解決方案；
演示
核心代碼：
ARAlignLabel.h
#import <UIKit/UIKit.h>@class ARMaker;typedef NS_ENUM(NSUInteger, textAlignType){ textAlignType_top = 10, // 頂部對齊 textAlignType_left, // 左邊對齊 textAlignType_bottom, // 底部對齊 textAlignType_right, // 右邊對齊 textAlignType_center // 水平/垂直對齊（默認(rèn)中心對齊）};@interface ARAlignLabel : UILabel/** * 根據(jù)對齊方式進(jìn)行文本對齊 * * @param alignType 對齊block */- (void)textAlign:(void(^)(ARMaker *make))alignType;@end//工具類@interface ARMaker : NSObject/* 存放對齊樣式 */@property(nonatomic, strong) NSMutableArray *typeArray;/** * 添加對齊樣式 */- (ARMaker *(^)(textAlignType type))addAlignType;@endARAlignLabel.m
#import "ARAlignLabel.h"@interface ARAlignLabel ()/* 對齊方式 */@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<self.typeArray.count; i++) { textAlignType type = [self.typeArray[i] integerValue]; switch (type) { case textAlignType_top: //頂部對齊 self.hasTop = YES; textRect.origin.y = bounds.origin.y; break; case textAlignType_left: //左部對齊 self.hasLeft = YES; textRect.origin.x = bounds.origin.x; break; case textAlignType_bottom: //底部對齊 self.hasBottom = YES; textRect.origin.y = bounds.size.height - textRect.size.height; break; case textAlignType_right: //右部對齊 self.hasRight = YES; textRect.origin.x = bounds.size.width - textRect.size.width; break; case textAlignType_center: if (self.hasTop) { //上中 textRect.origin.x = (bounds.size.width - textRect.size.width)*0.5; } else if (self.hasLeft) { //左中 textRect.origin.y = (bounds.size.height - textRect.size.height)*0.5; } else if (self.hasBottom) { //下中 textRect.origin.x = (bounds.size.width - textRect.size.width)*0.5; } else if (self.hasRight) { //右中 textRect.origin.y = (bounds.size.height - textRect.size.height)*0.5; } else{ //上下左右居中 textRect.origin.x = (bounds.size.width - textRect.size.width)*0.5; textRect.origin.y = (bounds.size.height - textRect.size.height)*0.5; } break; default: break; } } } return textRect;}- (void)drawTextInRect:(CGRect)requestedRect { CGRect actualRect = requestedRect; if (self.typeArray) { actualRect = [self textRectForBounds:requestedRect limitedToNumberOfLines:self.numberOfLines]; } [super drawTextInRect:actualRect];}- (void)textAlign:(void(^)(ARMaker *make))alignType { ARMaker *make = [[ARMaker alloc]init]; alignType(make); self.typeArray = make.typeArray;}@end//工具類@implementation ARMaker- (instancetype)init { self = [super init]; if (self) { self.typeArray = [NSMutableArray array]; } return self;}- (ARMaker *(^)(enum textAlignType type))addAlignType { __weak typeof (self) weakSelf = self; return ^(enum textAlignType type) { [weakSelf.typeArray addObject:@(type)]; return weakSelf; };}@end工具使用 - 九個(gè)方位對齊
- (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; if (_index == 9) { //富文本底部對齊 [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 = @"愛學(xué)習(xí)，愛編程，愛咖啡可樂"; 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; } }}富文本底部對齊
//富文本底部對齊- (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:@"單價(jià) $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; //對齊之后 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); }]; //設(shè)置部分文字的偏移量 (0是讓文字保持原來的位置, 負(fù)值是讓文字下移，正值是讓文字上移) [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; }富文本底部對齊 - 使用場景：
Github：https://github.com/ArchLL/ARUILabelTextAlign （本地下載）
總結(jié)
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