UILabel描边

头文件

#import <UIKit/UIKit.h>

@interface UIStrokeLabel:UILabel 

- (void)setStrokeColor:(UIColor*)strokeColor  width:(CGFloat)width;

@end

实现文件

#import "UIStrokeLabel.h"

@interface UIStrokeLabel ()
{
    UIColor *strokeColor_;

    CGFloat  strokeWidth_;
}
@end

@implementation UIStrokeLabel 

#pragma mark - initlize

- (id)init
{
    if(self= [super init]){
        strokeColor_ = [[UIColor whiteColor] retain];
        strokeWidth_ = 1.0f;
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame
{
    if(self= [super initWithFrame:frame]){
        strokeColor_ = [[UIColor whiteColor] retain];
        strokeWidth_ = 1.0f;
    }
    return self;

}

- (id)initWithCoder:(NSCoder*)aDecoder
{
    if(self= [super initWithCoder:aDecoder]){
        strokeColor_= [[UIColorwhiteColor] retain];
        strokeWidth_= 1.0f;
    }
    return self;
}

#pragma mark - stroke
- (void)setStrokeColor:(UIColor*)strokeColor width:(CGFloat)width
{
    [strokeColor_ release];
    strokeColor_ = nil;
    strokeColor_ = [strokeColor retain];
    strokeWidth_ = width;

    [self setNeedsDisplay];
}


- (void)drawTextInRect:(CGRect)rect
{
    CGSize  shadowOffset = self.shadowOffset;
    UIColor* textColor = self.textColor;

    CGContextRefcontext = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(context, strokeWidth_);
    CGContextSetLineJoin(context, kCGLineJoinRound);

    CGContextSetTextDrawingMode(context, kCGTextStroke);
    self.textColor = strokeColor_;

    [super drawTextInRect:rect];

    CGContextSetTextDrawingMode(context, kCGTextFill);
    self.textColor = textColor;
    self.shadowOffset = CGSizeMake(0.0f, 0.0f);
    [super drawTextInRect:rect];

    self.shadowOffset= shadowOffset;
}

- (void)dealloc
{
    [strokeColor_ release]; 
    [super dealloc];
}

@end