兩種方式 建立富文本的代碼 ios +

#import <CoreText/CoreText.h>

#import <QuartzCore/QuartzCore.h>

NSAttributedString *getAttributedString(){

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

                                              autorelease];

    //把this的字型顏色變為紅色

    [attriString addAttribute NSString *)kCTForegroundColorAttributeName

                        value id)[UIColor
redColor].CGColor 

                        range:NSMakeRange(0,
4)];

    //把is變為黃色

    [attriString addAttribute NSString *)kCTForegroundColorAttributeName

                        value id)[UIColor
yellowColor].CGColor 

                        range:NSMakeRange(5,
2)];

    //改變this的字型，value必須是一個CTFontRef

    [attriString addAttribute NSString *)kCTFontAttributeName

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

                                                      
14, 

                                                      
NULL)

                        range:NSMakeRange(0,
4)];

    //給this加上底線，value可以在指定的枚舉中選擇

    [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

轉自 Created by zhangao on 5/30/12.