这段时间在搞电子书，把这些天出现的问题归总下，我还是希望电子书的格式包括返回的数据，可直观的反应出客户端想表达的内容；原生的体验还是比较好的，希望对coretext再深入。
1.判断点击的位置是否在某个NSRange范围内
#pragma mark 判断点击的位置是否在 range内
/**
将点击的位置转换成字符串的偏移量，如果没有找到，则返回-1
view：view
point：点击位置
frameRef：当前view的frameRef
*/
+ (CFIndex)wkj_touchContentOffsetInView:(UIView *)view
point:(CGPoint)point
frameRef:(CTFrameRef)frameRef{
CTFrameRef textFrame = frameRef;
CFArrayRef lines = CTFrameGetLines(textFrame);
if (!lines) {
return -;
}
CFIndex count = CFArrayGetCount(lines); // 获得每一行的origin坐标
CGPoint origins[count];
CTFrameGetLineOrigins(textFrame, CFRangeMake(,), origins); // 翻转坐标系
CGAffineTransform transform = CGAffineTransformMakeTranslation(, view.bounds.size.height);
transform = CGAffineTransformScale(transform, .f, -.f); CFIndex idx = -;
for (int i = ; i < count; i++) {
CGPoint linePoint = origins[i];
CTLineRef line = CFArrayGetValueAtIndex(lines, i);
// 获得每一行的CGRect信息
CGRect flippedRect = [self wkj_getLineBounds:line point:linePoint];
CGRect rect = CGRectApplyAffineTransform(flippedRect, transform); if (CGRectContainsPoint(rect, point)) {
// 将点击的坐标转换成相对于当前行的坐标cocoapods
CGPoint relativePoint = CGPointMake(point.x-CGRectGetMinX(rect),
point.y-CGRectGetMinY(rect));
// 获得当前点击坐标对应的字符串偏移
idx = CTLineGetStringIndexForPosition(line, relativePoint);
}
}
return idx;
} + (CGRect)wkj_getLineBounds:(CTLineRef)line point:(CGPoint)point {
CGFloat ascent = 0.0f;
CGFloat descent = 0.0f;
CGFloat leading = 0.0f;
CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CGFloat height = ascent + descent;
return CGRectMake(point.x, point.y - descent, width, height);
} /**
此处判断
根据上面返回的字符串的偏移量，对比range是否在点击的位置
*/
+ (BOOL)wkj_judgeAtIndex:(CFIndex)index range:(NSRange)range {
if (NSLocationInRange(index, range)) {
///点击处在range内
return YES;
}
return NO;
}
2.通过CFRange与CTFrameRef获取要操作（涂色，划线）的CGRect数组
#pragma mark 通过range获取rect集合【用于划线、涂色】
+ (NSArray*)wkj_frameGetFrameOfStringInRange:(CTFrameRef)frameRef range:(CFRange)range{
CFRange frameRefRange = CTFrameGetStringRange(frameRef);
range = [self wkj_cfRangeInsection:frameRefRange range:range];
if ([self wkj_cfRangeEqualToRange:range range:CFRangeZero]) {
return nil;
} NSArray *lines = (NSArray*)CTFrameGetLines(frameRef);
NSInteger lineCount = [lines count];
//获取整个CTFrame的大小
CGPathRef path = CTFrameGetPath(frameRef);
CGRect frameRefRect = CGPathGetBoundingBox(path);
//获取所有行的起点
CGPoint *origins = (CGPoint*)malloc(lineCount * sizeof(CGPoint));
CTFrameGetLineOrigins(frameRef, CFRangeMake(, ), origins);
NSMutableArray *rects = [NSMutableArray array];
for (CFIndex index = ; index<lines.count; index++) {
CTLineRef line = (__bridge CTLineRef)[lines objectAtIndex:index];
CFRange rangeOfLine = CTLineGetStringRange(line);
CFRange rangeOfInsection = [self wkj_cfRangeInsection:rangeOfLine range:range];
if (![self wkj_cfRangeEqualToRange:rangeOfInsection range:CFRangeZero]) {
CGRect frame = [self wkj_lineGetFrame:line point:origins[index] range:rangeOfInsection];
frame = CGRectOffset(frame, frameRefRect.origin.x, frameRefRect.origin.y); [rects addObject:[NSValue valueWithCGRect:frame]];
}
}
free(origins);
return [rects copy];
} + (CGRect)wkj_lineGetFrame:(CTLineRef)line
point:(CGPoint)origin
range:(CFRange)range{
CFRange lineRange = CTLineGetStringRange(line);
range = [self wkj_cfRangeInsection:lineRange range:range];
CGFloat trailingWhitespaceWidth = CTLineGetTrailingWhitespaceWidth(line);
if ([self wkj_cfRangeGetEndLocation:range]==[self wkj_cfRangeGetEndLocation:lineRange]&&trailingWhitespaceWidth>) {
--range.length;
}
CGFloat xStart = CTLineGetOffsetForStringIndex(line, range.location, NULL);
CGFloat xEnd = CTLineGetOffsetForStringIndex(line, [self wkj_cfRangeGetEndLocation:range]+, NULL); CGFloat ascent, descent, leading; CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CGRect selectionRect = CGRectMake(origin.x + xStart,
origin.y - descent,
xEnd - xStart,
ascent + descent + leading); return selectionRect;
} + (CFRange)wkj_cfRangeInsection:(CFRange)range1 range:(CFRange)range2{
if ([self wkj_cfRangeGreaterThanRange:range1 range:range2]||[self wkj_cfRangeGreaterThanRange:range2 range:range1]) {
return CFRangeZero;
}
CFIndex beginLocation = MAX(range1.location, range2.location);
CFIndex endLocation = MIN([self wkj_cfRangeGetEndLocation:range1], [self wkj_cfRangeGetEndLocation:range2]); return [self wkj_cfRangeMakeWithInterval:beginLocation endIndex:endLocation];
} + (BOOL)wkj_cfRangeGreaterThanRange:(CFRange)range1 range:(CFRange)range2{
return range1.location>[self wkj_cfRangeGetEndLocation:range2];
}
+ (CFIndex)wkj_cfRangeGetEndLocation:(CFRange)range{
return range.location+range.length-;
}
+ (CFRange)wkj_cfRangeMakeWithInterval:(CFIndex)startIndex endIndex:(CFIndex)endIndex{
return CFRangeMake(startIndex, endIndex - startIndex + );
}
+ (BOOL)wkj_cfRangeEqualToRange:(CFRange)range1 range:(CFRange)range2{
return range1.location == range2.location&&range1.length==range2.length;
}
3.涂色划线
- (void)wkj_drawLineForSelectArea{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [[UIColor redColor] colorWithAlphaComponent:0.3].CGColor);
for (NSValue *rectValue in _arraySelectRect) {
CGRect rect = [rectValue CGRectValue];
rect.origin.y -= 2.5;
///划线时可设置高度为1 涂色是可根据字体大小设置
rect.size.height = ;
rect.size.width -= 1.5;
CGContextFillRect(context, rect);
}
}4.CoreText 分页
#pragma mark 分页
/**
CoreText 分页
str: NSAttributedString属性字符串
textFrame: 绘制区域
*/ + (NSArray *)wkj_coreTextPaging:(NSAttributedString *)str textArea:(CGRect)textFrame{
///分页NSAttributedString结果
// NSMutableArray *arrayPagingStr = [NSMutableArray array];
///分页NSRange结果
NSMutableArray *arrayPagingRange = [NSMutableArray array]; CFAttributedStringRef cfStrRef = (__bridge CFAttributedStringRef)str;
CTFramesetterRef framesetterRef = CTFramesetterCreateWithAttributedString(cfStrRef);
CGPathRef path = CGPathCreateWithRect(textFrame, NULL); int textPos = ;
NSUInteger strLength = [str length];
while (textPos < strLength) {
//设置路径
CTFrameRef frame = CTFramesetterCreateFrame(framesetterRef, CFRangeMake(textPos, ), path, NULL);
CFRange frameRange = CTFrameGetVisibleStringRange(frame);
NSRange range = NSMakeRange(frameRange.location, frameRange.length); [arrayPagingRange addObject:[NSValue valueWithRange:range]];
// [arrayPagingStr addObject:[str attributedSubstringFromRange:range]];
//移动
textPos += frameRange.length;
CFRelease(frame);
}
CGPathRelease(path);
CFRelease(framesetterRef);
// return arrayPagingStr;
return arrayPagingRange;
}
5.获取绘制区域的高度
/**
str:NSAttributedString 内容属性
width: 绘制的宽度
*/
+ (CGFloat)coretextContentHeight:(NSAttributedString *)str width:(CGFloat)width{
//创建CTFramesetterRef
CTFramesetterRef framesetterRef = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)str);
// 获得要绘制的区域高度
CGSize restrictSize = CGSizeMake(width, CGFLOAT_MAX);
CGSize coreTextSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetterRef, CFRangeMake(,), nil, restrictSize, nil);
return coreTextSize.height;
}
项目笔记
#import "BookDataTool.h"
#import "CoreTextDataModel.h" @implementation BookDataTool /**
CoreText 分页
str: NSAttributedString属性字符串
textFrame: 绘制区域
*/ + (NSArray *)wkj_coreTextPaging:(NSAttributedString *)str
textArea:(CGRect)textFrame{
// textFrame.size.height = textFrame.size.height; ///分页NSAttributedString结果
// NSMutableArray *arrayPagingStr = [NSMutableArray array];
///分页NSRange结果
NSMutableArray *arrayCoretext = [NSMutableArray array]; CFAttributedStringRef cfStrRef = (__bridge CFAttributedStringRef)str;
CTFramesetterRef framesetterRef = CTFramesetterCreateWithAttributedString(cfStrRef);
CGPathRef path = CGPathCreateWithRect(textFrame, NULL); int textPos = ;
NSUInteger strLength = [str length];
while (textPos < strLength) {
//设置路径
CTFrameRef frame = CTFramesetterCreateFrame(framesetterRef, CFRangeMake(textPos, ), path, NULL);
CFRange frameRange = CTFrameGetVisibleStringRange(frame);
NSRange range = NSMakeRange(frameRange.location, frameRange.length); // [arrayPagingRange addObject:[NSValue valueWithRange:range]];
// [arrayPagingStr addObject:[str attributedSubstringFromRange:range]]; CoreTextDataModel *model = [[CoreTextDataModel alloc]init];
model.ctFrame = frame;
model.range = range;
model.content = [str attributedSubstringFromRange:range]; [arrayCoretext addObject:model];
//移动
textPos += frameRange.length;
CFRelease(frame);
}
CGPathRelease(path);
CFRelease(framesetterRef);
// return arrayPagingStr;
return arrayCoretext;
} ///获取属性字符串
+ (NSAttributedString *)wkj_loadTemplateFile:(NSString *)path{
NSMutableAttributedString *resultAtt = [[NSMutableAttributedString alloc] init];
NSData *data = [NSData dataWithContentsOfFile:path];
if (data) {
NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
if ([array isKindOfClass:[NSArray class]]) {
for (NSDictionary *dic in array) {
if ([dic[@"type"] isEqualToString:@"txt"]) {
NSAttributedString *att = [self parseAttributedContentFromDictionary:dic];
[resultAtt appendAttributedString:att];
}
}
}
}
return resultAtt;
}
///获取属性字符串
+ (NSAttributedString *)parseAttributedContentFromDictionary:(NSDictionary *)dict{
NSMutableDictionary *attributes = [self attributes];
if ([dict[@"type1"] isEqualToString:@""]) {
CTFontRef fontRef = CTFontCreateWithName((CFStringRef)@"ArialMT", , NULL);
attributes[(id)kCTFontAttributeName] = (__bridge id)fontRef;
CFRelease(fontRef);
}
NSString *content = dict[@"content"];
return [[NSAttributedString alloc] initWithString:content attributes:attributes];
}
///获取属性字符串字典
+ (NSMutableDictionary *)attributes{
CGFloat fontSize = [BookThemeManager sharedManager].fontSize;
CTFontRef fontRef = CTFontCreateWithName((CFStringRef)@"ArialMT", fontSize, NULL);
CGFloat lineSpacing = [BookThemeManager sharedManager].lineSpace;
const CFIndex kNumberOfSettings = ;
CTParagraphStyleSetting theSettings[kNumberOfSettings] = {
{ kCTParagraphStyleSpecifierLineSpacingAdjustment, sizeof(CGFloat), &lineSpacing },
{ kCTParagraphStyleSpecifierMaximumLineSpacing, sizeof(CGFloat), &lineSpacing },
{ kCTParagraphStyleSpecifierMinimumLineSpacing, sizeof(CGFloat), &lineSpacing }
}; CTParagraphStyleRef theParagraphRef = CTParagraphStyleCreate(theSettings, kNumberOfSettings); UIColor * textColor = [BookThemeManager sharedManager].textColor; NSMutableDictionary * dict = [NSMutableDictionary dictionary];
dict[(id)kCTForegroundColorAttributeName] = (id)textColor.CGColor;
dict[(id)kCTFontAttributeName] = (__bridge id)fontRef;
dict[(id)kCTParagraphStyleAttributeName] = (__bridge id)theParagraphRef;
CFRelease(theParagraphRef);
CFRelease(fontRef);
return dict;
} @end