内容简介:ARAlignLabel.h
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<self.typeArray.count; i++) { textAlignType type = [self.typeArray[i] integerValue]; switch (type) { case textAlignType_top: //顶部对齐 self.hasTop = YES; textRect.origin.y = bounds.origin.y; break; case textAlignType_left: //左部对齐 self.hasLeft = YES; textRect.origin.x = bounds.origin.x; break; case textAlignType_bottom: //底部对齐 self.hasBottom = YES; textRect.origin.y = bounds.size.height - textRect.size.height; break; case textAlignType_right: //右部对齐 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 //工具类 @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
作者:Metro追光者
链接:https://www.jianshu.com/p/ab1eb2785ec0
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