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A multiline label drawn with core text. Needed it for line spacing, can easily be modified to use any core text properties though.
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// | |
// CoreTextLabel.h | |
// Frost | |
// | |
// Created by David Kasper on 10/1/12. | |
// | |
#import <UIKit/UIKit.h> | |
#import <CoreText/CoreText.h> | |
@interface CoreTextLabel : UILabel | |
@property (assign) CGFloat lineSpacing; | |
@end |
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// | |
// CoreTextLabel.m | |
// Frost | |
// | |
// Created by David Kasper on 10/1/12. | |
// | |
#import "CoreTextLabel.h" | |
@implementation CoreTextLabel | |
- (id)initWithFrame:(CGRect)frame | |
{ | |
self = [super initWithFrame:frame]; | |
if (self) { | |
// Initialization code | |
} | |
return self; | |
} | |
- (void)drawRect:(CGRect)rect | |
{ | |
// create a font, quasi systemFontWithSize:24.0 | |
CTFontRef sysUIFont = CTFontCreateWithName((__bridge_retained CFStringRef)self.font.fontName, self.font.pointSize,NULL); | |
// create a naked string | |
NSString *string = self.text; | |
CGColorRef color = self.textColor.CGColor; | |
// now for the actual drawing | |
CGContextRef context = UIGraphicsGetCurrentContext(); | |
// flip the coordinate system | |
CGContextSetTextMatrix(context, CGAffineTransformIdentity); | |
CGContextTranslateCTM(context, 0, self.bounds.size.height); | |
CGContextScaleCTM(context, 1.0, -1.0); | |
CTTextAlignment theAlignment = NSTextAlignmentToCTTextAlignment(self.textAlignment); | |
CFIndex theNumberOfSettings = 2; | |
CTParagraphStyleSetting theSettings[2] = | |
{ | |
{ kCTParagraphStyleSpecifierAlignment, sizeof(CTTextAlignment), | |
&theAlignment}, | |
{kCTParagraphStyleSpecifierLineSpacing, sizeof(CGFloat), &_lineSpacing} | |
}; | |
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(theSettings, theNumberOfSettings); | |
NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys: | |
(__bridge id)(sysUIFont), (NSString *)kCTFontAttributeName, | |
(__bridge id)color, (NSString *)kCTForegroundColorAttributeName, | |
paragraphStyle, (NSString *) kCTParagraphStyleAttributeName, | |
nil]; | |
NSAttributedString *stringToDraw = [[NSAttributedString alloc] initWithString:string attributes:attributesDict]; | |
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)stringToDraw); | |
//Create Frame | |
CGMutablePathRef path = CGPathCreateMutable(); | |
CGPathAddRect(path, NULL, rect); | |
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL); | |
//Draw Frame | |
CTFrameDraw(frame, context); | |
//Release all retained objects | |
CFRelease(path); | |
CFRelease(sysUIFont); | |
} | |
@end |
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