iOS 字符串上下标（一）

朴灿烈づ我的快乐病毒、 2022-06-08 06:36 123阅读 0赞

效果图：

![Image 1][]![Center][]

有关 iOS 字符串上下标 （二）[点击打开链接][Link 1]

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：

![Image 1][]![Center 1][]

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[Image 1]: 
[Center]: /images/20220608/276a1347861d4adb9fa20283fe6cc7df.png
[Link 1]: http://blog.csdn.net/dashenid/article/details/78040947
[Center 1]: /images/20220608/e8278ec0d1a248e8bb15461f8f310c1e.png