两种方式 创建富文本的代码 ios +

#import <CoreText/CoreText.h>

#import <QuartzCore/QuartzCore.h>

NSAttributedString *getAttributedString(){

    NSMutableAttributedString *attriString = [[[NSMutableAttributedString alloc] initWithString:@"this is test!"] 

                                              autorelease];

    //把this的字体颜色变为红色

    [attriString addAttribute:(NSString *)kCTForegroundColorAttributeName

                        value:(id)[UIColor redColor].CGColor 

                        range:NSMakeRange(0, 4)];

    //把is变为黄色

    [attriString addAttribute:(NSString *)kCTForegroundColorAttributeName

                        value:(id)[UIColor yellowColor].CGColor 

                        range:NSMakeRange(5, 2)];

    //改变this的字体，value必须是一个CTFontRef

    [attriString addAttribute:(NSString *)kCTFontAttributeName

                        value:(id)CTFontCreateWithName((CFStringRef)[UIFont boldSystemFontOfSize:14].fontName,

                                                       14, 

                                                       NULL)

                        range:NSMakeRange(0, 4)];

    //给this加上下划线，value可以在指定的枚举中选择

    [attriString addAttribute:(NSString *)kCTUnderlineStyleAttributeName

                        value:(id)[NSNumber numberWithInt:kCTUnderlineStyleDouble]

                        range:NSMakeRange(0, 4)];

    return attriString;

}

@interface TView : UIView

@end

@implementation TView

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

        self.backgroundColor = [UIColor clearColor];

    }

    return self;

}

-(void)drawRect:(CGRect)rect{

    [super drawRect:rect];

    

    NSAttributedString *attriString = getAttributedString();

    

    CGContextRef ctx = UIGraphicsGetCurrentContext();

    CGContextConcatCTM(ctx, CGAffineTransformScale(CGAffineTransformMakeTranslation(0, rect.size.height), 1.f, -1.f));

//    CGContextTranslateCTM(ctx, 0, rect.size.height);

//    CGContextScaleCTM(ctx, 1, -1);

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attriString);

    CGMutablePathRef path = CGPathCreateMutable();

    CGPathAddRect(path, NULL, rect);

    

    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL);

    CFRelease(path);

    CFRelease(framesetter);

    

    CTFrameDraw(frame, ctx);

    CFRelease(frame);

}

@end

@interface BIDViewController ()

@end

@implementation BIDViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    TView *view = [[TView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];

    [self.view addSubview:view];

    [view release];

    

    CATextLayer *textLayer = [CATextLayer layer];

    textLayer.string = getAttributedString();

    textLayer.frame = CGRectMake(0, CGRectGetMaxY(view.frame), 200, 200);

    [self.view.layer addSublayer:textLayer];

}

- (void)viewDidUnload

{

    [super viewDidUnload];

    // Release any retained subviews of the main view.

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

@end

转自 Created by zhangao on 5/30/12.