单一label多颜色多字体

来源：互联网发布：贵州网络贩枪编辑：程序博客网时间：2024/05/21 07:53

核心算法来源：http://code4app.com/ios/单一label多颜色多字体/512439bf6803fa4124000000

调用方法如下

AttributedLabel *label = [[AttributedLabel alloc] initWithFrame:CGRectMake(20, 20, 150, 40)];            // 注意！！一定要先给text赋值，然后再加属性；    label.text = @"this is test ";        [self.view addSubview:label];        // 设置this为红色    [label setColor:[UIColor redColor] fromIndex:0 length:4];        // 设置is为黄色    [label setColor:[UIColor yellowColor] fromIndex:5 length:2];        // 设置this字体为加粗16号字    [label setFont:[UIFont boldSystemFontOfSize:30] fromIndex:0 length:4];        // 给this加上下划线    [label setStyle:kCTUnderlineStyleDouble fromIndex:0 length:4];        label.backgroundColor = [UIColor clearColor];                //    预计到账时间：申请通过后3个工作日内    AttributedLabel *label2 = [[AttributedLabel alloc] initWithFrame:CGRectMake(20, 120, 250, 100)];    label2.text = @"预计到账时间：申请通过后3个工作日内";    [self.view addSubview:label2];        [label2 setColor:[UIColor blueColor] fromIndex:12 length:1];        label2.backgroundColor = [UIColor clearColor];

核心算法：

#import <UIKit/UIKit.h>#import <CoreText/CoreText.h>#import <QuartzCore/QuartzCore.h>@interface AttributedLabel : UILabel{    NSMutableAttributedString          *_attString;}// 设置某段字的颜色- (void)setColor:(UIColor *)color fromIndex:(NSInteger)location length:(NSInteger)length;// 设置某段字的字体- (void)setFont:(UIFont *)font fromIndex:(NSInteger)location length:(NSInteger)length;// 设置某段字的风格- (void)setStyle:(CTUnderlineStyle)style fromIndex:(NSInteger)location length:(NSInteger)length;@end

#import "AttributedLabel.h"@interface AttributedLabel(){}@property (nonatomic,retain)NSMutableAttributedString          *attString;@end@implementation AttributedLabel@synthesize attString = _attString;- (void)dealloc{//    [_attString release];//    [super dealloc];}- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}- (void)drawRect:(CGRect)rect{        CATextLayer *textLayer = [CATextLayer layer];    textLayer.string = _attString;    textLayer.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);    [self.layer addSublayer:textLayer];}- (void)setText:(NSString *)text{    [super setText:text];    if (text == nil) {        self.attString = nil;    }else{        self.attString = [[NSMutableAttributedString alloc] initWithString:text];    }}// 设置某段字的颜色- (void)setColor:(UIColor *)color fromIndex:(NSInteger)location length:(NSInteger)length{    if (location < 0||location>self.text.length-1||length+location>self.text.length) {        return;    }    [_attString addAttribute:(NSString *)kCTForegroundColorAttributeName                        value:(id)color.CGColor                        range:NSMakeRange(location, length)];}// 设置某段字的字体- (void)setFont:(UIFont *)font fromIndex:(NSInteger)location length:(NSInteger)length{    if (location < 0||location>self.text.length-1||length+location>self.text.length) {        return;    }    [_attString addAttribute:(NSString *)kCTFontAttributeName                        value:(id)CFBridgingRelease(CTFontCreateWithName((CFStringRef)font.fontName,                                                       font.pointSize,                                                       NULL))                        range:NSMakeRange(location, length)];}// 设置某段字的风格- (void)setStyle:(CTUnderlineStyle)style fromIndex:(NSInteger)location length:(NSInteger)length{    if (location < 0||location>self.text.length-1||length+location>self.text.length) {        return;    }    [_attString addAttribute:(NSString *)kCTUnderlineStyleAttributeName                        value:(id)[NSNumber numberWithInt:style]                        range:NSMakeRange(location, length)];}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    // Drawing code}*/@end

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