iOS 字符串上下标（一）

最新推荐文章于 2023-05-09 18:57:41 发布

原创最新推荐文章于 2023-05-09 18:57:41 发布 · 2.5k 阅读

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#iOS #字符串上下标

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有关 iOS 字符串上下标（二）点击打开链接

主要代码：继承于UILabel

PollutantFormatlabel.h

#import <UIKit/UIKit.h>

IB_DESIGNABLE
@interface PollutantFormatlabel : UILabel

+(void)PollutantFormatLabel:(UILabel *)label labelValue:(NSString *)labelValue;

@end

PollutantFormatlabel.m

#import "PollutantFormatlabel.h"
#import <CoreText/CoreText.h>
#import "ValueLabel.h"

@interface PollutantFormatlabel ()
@property(nonatomic,strong)NSDictionary *dic;

@end

@implementation PollutantFormatlabel

/**
 *   scripting 1-上标 -1-下标
 *   loc       从哪个位置开始
 *   len       需要上下标的长度
 */
-(NSDictionary *)dic {
    if (!_dic) {
        _dic = @{@"μg/m3":@{@"scripting":@1,@"loc":@4,@"len":@1},
                 @"mg/m3":@{@"scripting":@1,@"loc":@4,@"len":@1},
                 @"PM10": @{@"scripting":@(-1),@"loc":@2,@"len":@2},
                 @"PM2.5":@{@"scripting":@(-1),@"loc":@2,@"len":@3},
                 @"O3":   @{@"scripting":@(-1),@"loc":@1,@"len":@1},
                 @"O3_8H":@{@"scripting":@(-1),@"loc":@1,@"len":@1},
                 @"SO2":  @{@"scripting":@(-1),@"loc":@2,@"len":@1},
                 @"NO2":  @{@"scripting":@(-1),@"loc":@2,@"len":@1},
                 @"NOX":  @{@"scripting":@(-1),@"loc":@2,@"len":@1},
                 @"NOx":  @{@"scripting":@(-1),@"loc":@2,@"len":@1},
                 };
    }
    return _dic;
}

-(void)drawTextInRect:(CGRect)rect  {
    [PollutantFormatlabel PollutantFormatLabel:self labelValue:self.text];
    [super drawTextInRect:rect];
}

+(void)PollutantFormatLabel:(UILabel *)label labelValue:(NSString *)labelValue {
    PollutantFormatlabel *p = [PollutantFormatlabel new];
    
    float size = label.font.pointSize;
    UIFont *smallFont = [UIFont systemFontOfSize:size/1.7];
    NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:labelValue];
    [attString beginEditing];

    for (NSString *key in p.dic.allKeys) {
        NSRange strRange = [labelValue rangeOfString:key];
        if (strRange.location != NSNotFound) {
            NSDictionary *dic = p.dic[key];
            NSInteger loc = [dic[@"loc"] integerValue]+strRange.location;
            NSInteger len = [dic[@"len"] integerValue];
            NSRange range = NSMakeRange(loc,len);
            NSNumber *scripting = dic[@"scripting"];
            [attString addAttribute:NSFontAttributeName value:(smallFont) range:range];
            [attString addAttribute:(NSString*)kCTSuperscriptAttributeName value:scripting range:range];
        }
    }
    
    [attString endEditing];
    label.text = labelValue;
    label.attributedText = attString;
}

@end

使用：