UILabel字体间距调整

思路：

　　写一个 UILbel的子类；在子类里面重新布置UILbel的字体间距；

如代码 .h

#import <UIKit/UIKit.h>

@interface AdjustableUILable : UILabel

{

    CGFloat characterSpacing;

}

@property CGFloat characterSpacing;

@end

　代码　.m

#import "AdjustableUILable.h"

@implementation AdjustableUILable

@synthesize characterSpacing;

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

    }

    return self;

}

- (void)drawTextInRect:(CGRect)rect

{

    if (characterSpacing)

    {

        // Drawing code

        CGContextRef context = UIGraphicsGetCurrentContext();

        CGFloat size = self.font.pointSize;

        CGContextSelectFont (context, [self.font.fontName UTF8String], size, kCGEncodingMacRoman);

        CGContextSetCharacterSpacing (context, characterSpacing);

        CGContextSetTextDrawingMode (context, kCGTextFill);

        // Rotate text to not be upside down

        CGAffineTransform xform = CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0, 0.0);

        CGContextSetTextMatrix(context, xform);

        const char *cStr = [self.text UTF8String];

        CGContextShowTextAtPoint (context, rect.origin.x, rect.origin.y + size, cStr, strlen(cStr));

    }

    else

    {

        // no character spacing provided so do normal drawing

        [super drawTextInRect:rect];

    }

}

@end

　　如何使用：

    HistoryToday *yearDates = [HistoryToday today];

    AdjustableUILable *yearLabel = [[AdjustableUILable alloc]initWithFrame:CGRectMake(18, 6, 240, 30)];

    yearLabel.text = yearDates.year;

    yearLabel.characterSpacing = 14;

    [self.view addSubview:yearLabel];