杂乱小知识点总结

<p>http://ios-iphone.diandian.com/post/2012-03-26/18119641
</p><p><strong><span style="color:#cc0000;">数组中存储数据查询</span></strong></p>NSMutableDictionary *userDic1 = [NSMutableDictionary dictionaryWithCapacity:10];
NSMutableDictionary *userDic2 = [NSMutableDictionary dictionaryWithCapacity:10];
[userDic1 setValue:@"Li" forKey:@"name"];
[userDic2 setValue:@"Wang" forKey:@"name"];

NSArray *userArray = [NSArray arrayWithObjects:userDic1,userDic2,nil];
NSPredicate *namePredicate = [NSPredicate predicateWithFormat:@"SELF.name contains[cd] %@ ",@"L"];

NSMutableArray *searchArray = [NSMutableArray arrayWithArray:[userArray filteredArrayUsingPredicate:namePredicate]];

NSLog(@"searchArray  == %@",searchArray);

CoreText
总结

（1） NSAttributedString
NSAttributedString 可以将一段文字中的部分文字设置单独的字体和颜色。

与UITouch结合可以实现点击不同文字触发不同事件的交互功能。
主要方法：
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;

可以设置某段文字的字体名称，颜色，下滑线等信息。
- (void)removeAttribute:(NSString *)name range:(NSRange)range;
移除之前设置的字体属性值。
- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;
存储某段文字包含的信息（包括字体属性或其它，也可以存储一些自定义的信息）

- (NSDictionary *)attributesAtIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range;
通过location来获取某段文字中之前存储的信息NSDictionary

//设置字体

CTFontRef aFont = CTFontCreateWithName((CFStringRef)textFont.fontName, textFont.pointSize, NULL);

if (!aFont) return;

CTFontRef newFont = CTFontCreateCopyWithSymbolicTraits(aFont, 0.0, NULL, kCTFontItalicTrait, kCTFontBoldTrait); //将默认黑体字设置为其它字体

[self removeAttribute:(NSString*)kCTFontAttributeName range:textRange];

[self addAttribute:(NSString*)kCTFontAttributeName value:(id)newFont range:textRange];

CFRelease(aFont);

CFRelease(newFont);

//设置字体颜色

[self removeAttribute:(NSString*)kCTForegroundColorAttributeName range:textRange];

[self addAttribute:(NSString*)kCTForegroundColorAttributeName value:(id)textColor.CGColor range:textRange];

//设置对齐 换行

CTTextAlignment coreTextAlign = kCTLeftTextAlignment;

CTLineBreakMode coreTextLBMode = kCTLineBreakByCharWrapping;

CTParagraphStyleSetting paraStyles[2] =

{

{.spec = kCTParagraphStyleSpecifierAlignment, .valueSize = sizeof(CTTextAlignment), .value = (const void*)&coreTextAlign},

{.spec = kCTParagraphStyleSpecifierLineBreakMode, .valueSize = sizeof(CTLineBreakMode), .value = (const void*)&coreTextLBMode},

};

CTParagraphStyleRef aStyle = CTParagraphStyleCreate(paraStyles, 2);

[self removeAttribute:(NSString*)kCTParagraphStyleAttributeName range:textRange];

[self addAttribute:(NSString*)kCTParagraphStyleAttributeName value:(id)aStyle range:textRange];

CFRelease(aStyle);

（2）Draw NSAttributedString

CGContextRef cgc = UIGraphicsGetCurrentContext();

CGContextSaveGState(cgc);

//图像方向转换

CGContextConcatCTM(cgc, CGAffineTransformScale(CGAffineTransformMakeTranslation(0, self.bounds.size.height), 1.f, -1.f));

CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)weiBoText);

drawingRect = self.bounds;

CGMutablePathRef path = CGPathCreateMutable();

CGPathAddRect(path, NULL, drawingRect);

textFrame = CTFramesetterCreateFrame(framesetter,CFRangeMake(0,0), path, NULL);

CGPathRelease(path);

CFRelease(framesetter);

CTFrameDraw(textFrame, cgc);

CGContextRestoreGState(cgc);

（3）图文混排
CTFrameRef textFrame // coreText 的 frame
CTLineRef line // coreText 的 line
CTRunRef run // line 中的部分文字

相关方法：

CFArrayRef CTFrameGetLines (CTFrameRef frame ) //获取包含CTLineRef的数组

void CTFrameGetLineOrigins(

CTFrameRef frame,

CFRange range,

CGPoint origins[] ) //获取所有CTLineRef的原点
CFRange CTLineGetStringRange (CTLineRef line ) //获取line中文字在整段文字中的Range

CFArrayRef CTLineGetGlyphRuns (CTLineRef line ) //获取line中包含所有run的数组

CFRange CTRunGetStringRange (CTRunRef run ) //获取run在整段文字中的Range
CFIndex CTLineGetStringIndexForPosition(

CTLineRef line,

CGPoint position ) //获取点击处position文字在整段文字中的index

CGFloat CTLineGetOffsetForStringIndex(

CTLineRef line,

CFIndex charIndex,

CGFloat* secondaryOffset ) //获取整段文字中charIndex位置的字符相对line的原点的x值

主要步骤：
1）计算并存储文字中保含的所有表情文字及其Range
2）替换表情文字为指定宽度的NSAttributedString
CTRunDelegateCallbacks callbacks;

callbacks.version = kCTRunDelegateVersion1;

callbacks.getAscent = ascentCallback;

callbacks.getDescent = descentCallback;

callbacks.getWidth = widthCallback;

callbacks.dealloc = deallocCallback;

CTRunDelegateRef runDelegate = CTRunDelegateCreate(&callbacks, NULL);

NSDictionary *attrDictionaryDelegate = [NSDictionary dictionaryWithObjectsAndKeys:

(id)runDelegate, (NSString*)kCTRunDelegateAttributeName,

[UIColor clearColor].CGColor,(NSString*)kCTForegroundColorAttributeName,

nil];

NSAttributedString *faceAttributedString = [[NSAttributedString alloc] initWithString:@"*" attributes:attrDictionaryDelegate];

[weiBoText replaceCharactersInRange:faceRange withAttributedString:faceAttributedString];

[faceAttributedString release];

3) 根据保存的表情文字的Range计算表情图片的Frame
textFrame 通过CTFrameGetLines 获取所有line的数组 lineArray

遍历lineArray中的line通过CTLineGetGlyphRuns获取line中包含run的数组 runArray

遍历runArray中的run 通过CTRunGetStringRange获取run的Range

判断表情文字的location是否在run的Range

如果在 通过CTLineGetOffsetForStringIndex获取x的值 y的值为line原点的值

4）Draw表情图片到计算获取到的Frame

（3）点击文字触发事件

主要步骤：
1） 根据touch事件获取点point
2) textFrame 通过CTFrameGetLineOrigins获取所有line的原点
3） 比较point和line原点的y值获取点击处于哪个line
4) line、point 通过CTLineGetStringIndexForPosition获取到点击字符在整段文字中的 index

5) NSAttributedString 通过index 用方法－(NSDictionary *)attributesAtIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range 可以获取到点击到的NSAttributedString中存储的NSDictionary

6） 通过NSDictionary中存储的信息判断点击的哪种文字类型分别处理