ios开发之改变文本行间距和字符间距

冷不防 2022-09-24 14:19 659阅读 0赞

# [ios开发之 改变文本行间距和字符间距][ios_] #

\#import <UIKit/UIKit.h>  
  
@interface LineSpaceLabel : UILabel\{  
    CGFloat charSpace\_;  
    CGFloat lineSpace\_;  
\}  
@property(nonatomic, assign) CGFloat charSpace;  
@property(nonatomic, assign) CGFloat lineSpace;  
  
@end

\#import "LineSpaceLabel.h"  
\#import <CoreText/CoreText.h>  
\#import<Foundation/Foundation.h>  
@implementation LineSpaceLabel  
@synthesize lineSpace = lineSpace\_;  
@synthesize charSpace = charSpace\_;  
\- (id)initWithFrame:(CGRect)frame  
\{  
    self = \[super initWithFrame:frame\];  
    if (self) \{  
        // Initialization code  
        lineSpace\_ = 5.0;  
        charSpace\_ = 2.0;  
    \}  
    return self;  
\}  
  
\-(void)awakeFromNib\{  
    \[super awakeFromNib\];  
    lineSpace\_ = 5.0;  
    charSpace\_ = 2.0;  
\}  
  
\-(void)setCharSpace:(CGFloat)charSpace\{  
    charSpace\_ = charSpace;  
    \[self setNeedsDisplay\];  
\}  
\-(void)setLineSpace:(CGFloat)lineSpace\{  
    lineSpace\_ = lineSpace;  
     \[self setNeedsDisplay\];  
\}  
  
\-(void) drawTextInRect:(CGRect)requestedRect  
  
\{  
      
    //创建AttributeString  
      
    NSMutableAttributedString \*string =\[\[NSMutableAttributedString alloc\]initWithString:self.text\];  
      
    //设置字体及大小  
      
    CTFontRef helveticaBold = CTFontCreateWithName((CFStringRef)self.font.fontName,self.font.pointSize,NULL);  
      
    \[string addAttribute:(id)kCTFontAttributeName value:(id)helveticaBold range:NSMakeRange(0,\[string length\])\];  
      
    //设置字间距  
      
    if(self.charSpace)  
          
    \{  
        long number = self.charSpace;  
        CFNumberRef num = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&number);  
        \[string addAttribute:(id)kCTKernAttributeName value:(id)num range:NSMakeRange(0,\[string length\])\];  
        CFRelease(num);  
    \}  
      
    //设置字体颜色  
      
    \[string addAttribute:(id)kCTForegroundColorAttributeName value:(id)(self.textColor.CGColor) range:NSMakeRange(0,\[string length\])\];  
      
    //创建文本对齐方式  
      
    CTTextAlignment alignment = kCTLeftTextAlignment;  
      
    if(self.textAlignment == UITextAlignmentCenter)  
          
    \{  
        alignment = kCTCenterTextAlignment;  
          
    \}  
      
    if(self.textAlignment == UITextAlignmentRight)  
          
    \{  
          
        alignment = kCTRightTextAlignment;  
          
    \}  
      
    CTParagraphStyleSetting alignmentStyle;  
      
    alignmentStyle.spec = kCTParagraphStyleSpecifierAlignment;  
      
    alignmentStyle.valueSize = sizeof(alignment);  
      
    alignmentStyle.value = &alignment;  
      
    //设置文本行间距  
      
    CGFloat lineSpace = self.lineSpace;  
      
    CTParagraphStyleSetting lineSpaceStyle;  
      
    lineSpaceStyle.spec = kCTParagraphStyleSpecifierLineSpacingAdjustment;  
      
    lineSpaceStyle.valueSize = sizeof(lineSpace);  
      
    lineSpaceStyle.value =&lineSpace;  
      
    //设置文本段间距  
      
    CGFloat paragraphSpacing = 5.0;  
      
    CTParagraphStyleSetting paragraphSpaceStyle;  
      
    paragraphSpaceStyle.spec = kCTParagraphStyleSpecifierParagraphSpacing;  
      
    paragraphSpaceStyle.valueSize = sizeof(CGFloat);  
      
    paragraphSpaceStyle.value = &paragraphSpacing;  
      
      
      
    //创建设置数组  
      
    CTParagraphStyleSetting settings\[ \] =\{alignmentStyle,lineSpaceStyle,paragraphSpaceStyle\};  
      
    CTParagraphStyleRef style = CTParagraphStyleCreate(settings ,3);  
      
    //给文本添加设置  
      
    \[string addAttribute:(id)kCTParagraphStyleAttributeName value:(id)style range:NSMakeRange(0 , \[string length\])\];  
      
    //排版  
      
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)string);  
      
    CGMutablePathRef leftColumnPath = CGPathCreateMutable();  
      
    CGPathAddRect(leftColumnPath, NULL ,CGRectMake(0 , 0 ,self.bounds.size.width , self.bounds.size.height));  
      
    CTFrameRef leftFrame = CTFramesetterCreateFrame(framesetter,CFRangeMake(0, 0), leftColumnPath , NULL);  
      
    //翻转坐标系统（文本原来是倒的要翻转下）  
      
    CGContextRef context = UIGraphicsGetCurrentContext();  
      
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);  
      
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);  
      
    CGContextScaleCTM(context, 1.0 ,-1.0);  
      
    //画出文本  
      
    CTFrameDraw(leftFrame,context);  
      
    //释放  
      
    CGPathRelease(leftColumnPath);  
      
    CFRelease(framesetter);  
      
    CFRelease(helveticaBold);  
      
    \[string release\];  
      
    UIGraphicsPushContext(context);  
\}  
  
@end

[ios_]: http://www.cnblogs.com/mtfh/p/3164740.html