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iOS开发笔记－一种任意字体、颜色混排UILabel的实现

最近开发新App，射妓狮给的图上出现一种不同大小字体混排的Label，就像下面这种：

想了想，最简单的方法是使用多个UILabel排列显示，但是这样不仅麻烦而且效果也不好，索性自定义UILabel来尽可能的满足使用灵活性。

实现方法

与正常自定义控件的方法类似，主要利用了Core Graphics来动态绘制字体，但这里字体的参数都用NSArray存储，以尽最大可能不受具体内容约束，实现灵活性。

代码如下：

// //  UnevenHeightLabel.h //  demo // //  Created by ZhangChangwei on 15/3/31. //  Copyright (c) 2015年 Changwei. All rights reserved. //  #import <UIKit/UIKit.h>  @interface UnevenHeightLabel : UIView @property (nonatomic) NSArray *strings; @property (nonatomic) NSArray *fonts; @property (nonatomic) NSArray *fontFrames; @property (nonatomic) NSArray *fontColors;  -(instancetype) initWithUnevenHeightStrings:(NSArray *)strings stringFonts:(NSArray *)fonts stringRects:(NSArray *)rects stringColors:(NSArray *) colors; @end

// //  UnevenHeightLabel.m //  demo // //  Created by ZhangChangwei on 15/3/31. //  Copyright (c) 2015年 Changwei. All rights reserved. //  #import "UnevenHeightLabel.h" #import "UIColor+HexColor.h" @implementation UnevenHeightLabel // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect {  // Drawing code  CGContextRef ctx = UIGraphicsGetCurrentContext();  CGContextSetLineWidth(ctx, 1.0f);  if(_strings!=nil&& _strings.count>0){   for (int i=0; i<_strings.count; i++) {    [_strings[i] drawInRect:[(NSValue *)_fontFrames[i] CGRectValue] withAttributes:@{NSFontAttributeName:_fonts[i],                         NSForegroundColorAttributeName:_fontColors[i]}];   }  } } -(instancetype)initWithUnevenHeightStrings:(NSArray *)strings stringFonts:(NSArray *)fonts stringRects:(NSArray *)rects stringColors:(NSArray *)colors{  self=[super init];  self.strings=strings;  self.fonts=fonts;  self.fontFrames=rects;  self.fontColors=colors;  //[self setNeedsDisplay];  return self; } @end

Demo：

使用方法很简单，直接在需要使用的地方调用，如下：

- (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view, typically from a nib.     UnevenHeightLabel *mylabel=[[UnevenHeightLabel alloc] initWithUnevenHeightStrings:@[@"A",@"a",@"B",@"b",@"C",@"c"]          stringFonts:@[[UIFont systemFontOfSize:25],           [UIFont systemFontOfSize:20],           [UIFont systemFontOfSize:25],           [UIFont systemFontOfSize:20],           [UIFont systemFontOfSize:25],           [UIFont systemFontOfSize:20]]          stringRects:@[           [NSValue valueWithCGRect:CGRectMake(0, 0, 40, 30)],           [NSValue valueWithCGRect:CGRectMake(20, 5, 20, 20)],           [NSValue valueWithCGRect:CGRectMake(35, 0, 25, 30)],           [NSValue valueWithCGRect:CGRectMake(55, 5, 20, 20)],           [NSValue valueWithCGRect:CGRectMake(70, 0, 25, 30)],           [NSValue valueWithCGRect:CGRectMake(90, 5, 20, 20)]]         stringColors:@[           [UIColor redColor],           [UIColor orangeColor],           [UIColor greenColor],           [UIColor blueColor],           [UIColor cyanColor],           [UIColor purpleColor]]];     [mylabel setFrame:CGRectMake(SCREEN_WIDTH/2-55, SCREEN_HEIGHT/2-30, 110, 50)];     [mylabel setBackgroundColor:[UIColor clearColor]];     [self.view addSubview:mylabel];     UnevenHeightLabel *mylabel1=[[UnevenHeightLabel alloc] initWithUnevenHeightStrings:@[@"11.",@"0",@"%"]           stringFonts:@[[UIFont systemFontOfSize:25],            [UIFont systemFontOfSize:20],            [UIFont systemFontOfSize:25]]           stringRects:@[            [NSValue valueWithCGRect:CGRectMake(0, 0, 40, 30)],            [NSValue valueWithCGRect:CGRectMake(35, 5, 20, 20)],            [NSValue valueWithCGRect:CGRectMake(50, 0, 25, 30)]]          stringColors:@[[UIColor getColorFromHex:@"#ff8946"],            [UIColor getColorFromHex:@"#ff8946"],[UIColor getColorFromHex:@"#ff8946"]]];     [mylabel1 setFrame:CGRectMake(SCREEN_WIDTH/2-50, SCREEN_HEIGHT/2+30, 100, 50)];     [mylabel1 setBackgroundColor:[UIColor clearColor]];     [self.view addSubview:mylabel1]; }