#import "Myview.h"

#import

@implementation Myview

-(void)dealloc

{

[_text release];

[super dealloc];

}

- (id)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

self.font = 15;

self.text

= @"请给myview.text赋值";

self.line = 10;

self.paragraph = 20;

self.character = 4;

}

return self;

}

-(void)drawRect:(CGRect)rect

{

[super drawRect:rect];

//创建AttributeStringfdsa

NSMutableAttributedString *string = [[NSMutableAttributedString

alloc]

initWithString:self.text];

//创建字体以及字体大小

CTFontRef helvetica = CTFontCreateWithName(CFSTR("Helvetica"), self.font, NULL);

CTFontRef helveticaBold = CTFontCreateWithName(CFSTR("Helvetica"), self.font, NULL);

//字体，把helvetica

样式加到整个，string上

[string addAttribute:(id)kCTFontAttributeName

value:(id)helvetica

range:NSMakeRange(0, [string length])];

//字体样式

,把helveticaBold

样式加到整个，string上

[string addAttribute:(id)kCTFontAttributeName

value:(id)helveticaBold

range:NSMakeRange(0, [string length])];

//颜色,此处为黑色，你可以自己改颜色，[UIColor

redColor]

[string addAttribute:(id)kCTForegroundColorAttributeName

value:(id)[UIColor blackColor].CGColor

range:NSMakeRange(0, [string length])];

//创建文本对齐方式

CTTextAlignment alignment =

kCTJustifiedTextAlignment;//对齐方

CTParagraphStyleSetting alignmentStyle;

alignmentStyle.spec=kCTParagraphStyleSpecifierAlignment;

alignmentStyle.valueSize=sizeof(alignment);

alignmentStyle.value=&alignment;

//设置字体间距

long number

= self.character;

CFNumberRef num = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt8Type, &number);

[string addAttribute:(id)kCTKernAttributeName value:(id)num range:NSMakeRange(0, [string length])];

CFRelease(num);

//创建文本,

行间距

CGFloat lineSpace=self.line;//间距数据

CTParagraphStyleSetting lineSpaceStyle;

lineSpaceStyle.spec=kCTParagraphStyleSpecifierLineSpacing;

lineSpaceStyle.valueSize=sizeof(lineSpace);

lineSpaceStyle.value=&lineSpace;

//设置

段落间距

CGFloat paragraph = self.paragraph;

CTParagraphStyleSetting paragraphStyle;

paragraphStyle.spec

=

kCTParagraphStyleSpecifierParagraphSpacing;

paragraphStyle.valueSize = sizeof(CGFloat);

paragraphStyle.value = &paragraph;

//创建样式数组

CTParagraphStyleSetting settings[]={

alignmentStyle,lineSpaceStyle,paragraphStyle

};

//设置样式

CTParagraphStyleRef paragraphStyle1 =

CTParagraphStyleCreate(settings,

sizeof(settings));

//给字符串添加样式attribute

[string addAttribute:(id)kCTParagraphStyleAttributeName

value:(id)paragraphStyle1

range:NSMakeRange(0, [string length])];

// layout master

CTFramesetterRefframesetter =

CTFramesetterCreateWithAttributedString((CFAttributedStringRef)string);

//计算文本绘制size

，这里300是文字宽度，你可以自己更改为247，但是要记得，在height 方法里的这个位置，也改为247

CGSize tmpSize

= CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0,0),

NULL, CGSizeMake(300,

MAXFLOAT), NULL);

//创建textBoxSize以设置view的frame

CGSize textBoxSize = CGSizeMake((int)tmpSize.width + 1, (int)tmpSize.height + 1);

// NSLog(@"textBoxSize0 ==

%f,%f,%f",textBoxSize.width,textBoxSize.height,textBoxSize.width /

textBoxSize.height);

self.frame = CGRectMake(0, 0,

textBoxSize.width ,

textBoxSize.height);

[string release];

//-

(void)drawRect:(CGRect)rect;代码

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);

// NSLog(@"textBoxSize1 ==

%f,%f",self.frame.size.width,self.frame.size.height);

// flip the coordinate system

CGContextRef context =

UIGraphicsGetCurrentContext();

CGContextClearRect(context, self.frame);

CGContextSetFillColorWithColor(context,

[[UIColor

whiteColor]CGColor]);

CGContextFillRect(context, CGRectMake(0, 0,

320, self.frame.size.height));

CGContextSetTextMatrix(context,

CGAffineTransformIdentity);

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

CGContextScaleCTM(context, 1.0, -1.0);

// draw

CTFrameDraw(leftFrame, context);

// cleanup

CGPathRelease(leftColumnPath);

CFRelease(framesetter);

//CFRelease(helvetica);

// CFRelease(helveticaBold);

UIGraphicsPushContext(context);

}

#pragma mark - 计算高度的方法

//这个方法，剪切到你要用的那个类里面，就ok了

// 或者，就放这里，但改成实例方法，+(CGSize)height:^^^^^^^^^

-(CGSize)height:(NSString *)text Font:(CGFloat)font Character:(CGFloat)character Line:(CGFloat)line Pragraph:(CGFloat)pragraph

{

//创建AttributeStringfdsa

NSMutableAttributedString *string = [[NSMutableAttributedString

alloc]

initWithString:text];

//创建字体以及字体大小

CTFontRef helvetica = CTFontCreateWithName(CFSTR("Helvetica"), font, NULL);

CTFontRef helveticaBold = CTFontCreateWithName(CFSTR("Helvetica"), font, NULL);

//添加字体目标字符串从下标0开始到字符串结尾

[string addAttribute:(id)kCTFontAttributeName

value:(id)helvetica

range:NSMakeRange(0, [string length])];

//添加字体目标字符串从下标0开始，截止到4个单位的长度

[string addAttribute:(id)kCTFontAttributeName

value:(id)helveticaBold

range:NSMakeRange(0, [string length])];

[string addAttribute:(id)kCTForegroundColorAttributeName

value:(id)[UIColor whiteColor].CGColor

range:NSMakeRange(0, [string length])];

CTTextAlignment alignment =

kCTJustifiedTextAlignment;//这种对齐方式会自动调整，使左右始终对齐

CTParagraphStyleSetting alignmentStyle;

alignmentStyle.spec=kCTParagraphStyleSpecifierAlignment;//指定为对齐属性

alignmentStyle.valueSize=sizeof(alignment);

alignmentStyle.value=&alignment;

//设置字体间距

long number = character;

CFNumberRef num = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt8Type, &number);

[string addAttribute:(id)kCTKernAttributeName value:(id)num range:NSMakeRange(0, [string length])];

CFRelease(num);

//创建文本行间距

CGFloat lineSpace=line;//间距数据

CTParagraphStyleSetting lineSpaceStyle;

lineSpaceStyle.spec=kCTParagraphStyleSpecifierLineSpacing;//指定为行间距属性

lineSpaceStyle.valueSize=sizeof(lineSpace);

lineSpaceStyle.value=&lineSpace;

//设置段落间距

CGFloat paragraph = pragraph;

CTParagraphStyleSetting paragraphStyle;

paragraphStyle.spec

=

kCTParagraphStyleSpecifierParagraphSpacing;

paragraphStyle.valueSize = sizeof(CGFloat);

paragraphStyle.value = &paragraph;

//创建样式数组

CTParagraphStyleSetting settings[]={

alignmentStyle,lineSpaceStyle,paragraphStyle

};

//设置样式

CTParagraphStyleRef paragraphStyle1 =

CTParagraphStyleCreate(settings,

sizeof(settings));

//给字符串添加样式attribute

[string addAttribute:(id)kCTParagraphStyleAttributeName

value:(id)paragraphStyle1

range:NSMakeRange(0, [string length])];

// layout master

CTFramesetterRefframesetter =

CTFramesetterCreateWithAttributedString((CFAttributedStringRef)string);

//计算文本绘制size

CGSize tmpSize

= CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0,0),

NULL, CGSizeMake(300,

MAXFLOAT), NULL);

//创建textBoxSize以设置view的frame

CGSize textBoxSize = CGSizeMake((int)tmpSize.width + 1, (int)tmpSize.height + 1);

[string release];

return textBoxSize;

}

@end

3.

注意上面的Myview 默认要绘制的文字宽度是 300，如果你想要的文字宽度是 200，请你去改代码，

//计算文本绘制size

，这里300是文字宽度，你可以自己更改为200，但是要记得，在height 方法里的这个位置，也改为200，这个很重要

CGSizetmpSize

=CTFramesetterSuggestFrameSizeWithConstraints(framesetter,CFRangeMake(0,0),NULL,CGSizeMake(300,MAXFLOAT),NULL);

把这个MyView

加入到你的工程里面，就完成了工作的80%了，接下来，更简单，

4  看完下面的，你就会了

我们知道，不同文字他的高度，是不确定的，如果超过 height 460，548,那么你一个屏幕是显示不下的

这时候，我们怎么用这个Myview呢

请看下面的具体用法，

@property(nonatomic,assign)CGSize

size;

@property(nonatomic,retain)NSString *text;

-

(void)viewDidLoad

{

[super

viewDidLoad];

self.text =

@"";你自己赋值，

self.size

= [self height:self.text

Font:15 Character:4

Line:10 Pragraph:20];

//必须先计算高度

NSLog(@"width:%f, height:%f",self.size.width,self.size.height);

}

//在下面这个方法中的用法，

-(UITableViewCell*)tableView:(UITableView *)tableView

cellForRowAtIndexPath:(NSIndexPath *)indexPath

Myview

*myview =

[[Myview

alloc]initWithFrame:CGRectMake(0, 0, self.size.width, self.size.height)];//知道为什么，先算高度了吧

myview.text = self.text;

myview.font = 15;

myview.line = 10;

myview.paragraph = 20;

myview.character = 4; //这些值比须和，height方法里传的5个参数一一对  //应相等。

UIView *v1 = [[UIView alloc]initWithFrame:CGRectMake(8, 10,

304, self.size.height)]; //这里并不是多此一举，不信你自己去掉试试，你会发

//现，你画的文字，是从(0，y，width，height)这里开始画的，和里myview的

//CGRectMake(x,y,300,height)x,y无关。

[v1 addSubview:myview];

[cell addSubview:v1];

当然cell的高度，也是我们算好了的

-(CGFloat)tableView:(UITableView *)tableView

heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

return self.size.height+20;

}

5

到此，你应该已经会了，如果关键的第4步，你没看懂，那么请看下篇，我贴出了，使用Myview的详细全部代码，你直接使用之后就明白了。