IOS利用Core Text對文字進行排版

2011-12-08 11:10

core text 這個包預設是沒有的，要自己手動新增進來。

在ios中利用core text對文字進行排版的幾個關鍵點如下：

字間距：kctkernattributename

行間距：kctparagraphstylespecifierlinespacingadjustment 或 kctparagraphstylespecifierlinespacing(不推薦使用)

段間距：kctparagraphstylespecifierparagraphspacing

文字對齊方式：kctparagraphstylespecifieralignment;

還有一點就是core text顯示出來的字是顛倒的，使用時要翻轉下:

cgcontextref context = uigraphicsgetcurrentcontext();

cgcontextsettextmatrix(context,cgaffinetransformidentity);

cgcontexttranslatectm(context,0,self.bounds.size.height);

cgcontextscalectm(context,1.0,-1.0);

最後一點要注意的是mac下的回車和windows的是不一樣的，windows下的回車是由\r \n組成的而mac下只有乙個\n，所以如果沒有去掉的話在每一段的最後都會多出乙個空行來，去掉的方法如下：

nsstring *mystring = [labelstring stringbyreplacingoccurrencesofstring:@"\r\n" withstring:@"\n"];

具體的**實現如下：

#import

@inte***ce textlayoutlabel : uilabel

@property(nonatomic,assign) cgfloat characterspacing;

@propery(nonatomic,assign)long linesspacing;

@end

#import "textlayoutlabel.h"

#import

@implementation textlayoutlabel

@synthesize characterspacing = characterspacing_;

@synthesize linesspacing = linesspacing_;

-(id) initwithframe:(cgrect)frame

return self;

}-(void)setcharacterspacing:(cgfloat)characterspacing //外部呼叫設定字間距

-(void)setlinesspacing:(long)linesspacing //外部呼叫設定行間距

-(void) drawtextinrect:(cgrect)requestedrect

//設定字型顏色

[string addattribute:(id)kctforegroundcolorattributename value:(id)(self.textcolor.cgcolor) range:nsmakerange(0,[string length])];

//建立文字對齊方式

cttextalignment alignment = kctlefttextalignment;

if(self.textalignment == uitextalignmentcenter)

if(self.textalignment == uitextalignmentright)

ctparagraphstylesetting alignmentstyle;

alignmentstyle.spec = kctparagraphstylespecifieralignment;

alignmentstyle.valuesize = sizeof(alignment);

alignmentstyle.value = &alignment;

//設定文字行間距

cgfloat linespace = self.linesspacing;

ctparagraphstylesetting linespacestyle;

linespacestyle.spec = kctparagraphstylespecifierlinespacingadjustment;

linespacestyle.valuesize = sizeof(linespace);

linespacestyle.value =&linespace;

//設定文字段間距

cgfloat paragraphspacing = 5.0;

ctparagraphstylesetting paragraphspacestyle;

paragraphspacestyle.spec = kctparagraphstylespecifierparagraphspacing;

paragraphspacestyle.valuesize = sizeof(cgfloat);

paragraphspacestyle.value = ¶graphspacing;

//建立設定陣列

ctparagraphstylesetting settings[ ] =;

ctparagraphstyleref style = ctparagraphstylecreate(settings ,3);

//給文字新增設定

[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);

//翻轉座標系統（文字原來是倒的要翻轉下）

cgcontextref context = uigraphicsgetcurrentcontext();

cgcontextsettextmatrix(context , cgaffinetransformidentity);

cgcontexttranslatectm(context , 0 ,self.bounds.size.height);

cgcontextscalectm(context, 1.0 ,-1.0);

//畫出文字

ctframedraw(leftframe,context);

//釋放

cgpathrelease(leftcolumnpath);

cfreleale(framesetter);

cfrelease(helveticabold);

[string release];

uigraphicspushcontext(context);

}@end

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