ios – 使用CALayer突出显示跨越多行的UITextView中的文本

概述这是 Getting CGRect for text in a UITextView for the purpose of highlighting with a CALayer的延续.我在为每个线段中的范围获取正确的矩形时遇到问题. NSString* searchString = @"Returns the range of characters that generated";NSRang @H_502_0@这是 Getting CGRect for text in a UITextView for the purpose of highlighting with a CALayer的延续.我在为每个线段中的范围获取正确的矩形时遇到问题.

Nsstring* searchString = @"Returns the range of characters that generated";NSRange match = [[[self textVIEw]text]rangeOfString:searchString];NSRange matchingGlyphRange = [manager glyphRangeForCharacterRange:match actualCharacterRange:NulL];[manager enumeratelineFragmentsForGlyphRange:matchingGlyphRange usingBlock: ^(CGRect lineRect,CGRect usedRect,NSTextContainer *textContainer,NSRange lineRange,BOol *stop) {     NSRange currentRange = NSIntersectionRange(lineRange,matchingGlyphRange);     [manager enumerateEnclosingRectsForGlyphRange:currentRange withinSelectedGlyphRange:NSMakeRange(NSNotFound,0) inTextContainer:textContainer usingBlock:      ^(CGRect rect,BOol* stop) {         if (usedRect.origin.y == rect.origin.y && NSLocationInRange(currentRange.location,lineRange)) {             CGRect theRect = [manager boundingRectForGlyphRange:currentRange inTextContainer:textContainer];             CALayer* roundRect = [CALayer layer];             [roundRect setFrame:theRect];             [roundRect setBounds:theRect];             [roundRect setCornerRadius:5.0f];             [roundRect setBackgroundcolor:[[UIcolor bluecolor]CGcolor]];             [roundRect setopacity:0.2f];             [roundRect setbordercolor:[[UIcolor blackcolor]CGcolor]];             [roundRect setborderWIDth:3.0f];             [roundRect setShadowcolor:[[UIcolor blackcolor]CGcolor]];             [roundRect setShadowOffset:CGSizeMake(20.0f,20.0f)];             [roundRect setShadowOpacity:1.0f];             [roundRect setShadowRadius:10.0f];             [[[self textVIEw]layer]addSublayer:roundRect];             *stop = YES;         }     }];}];

这是我目前的尝试.我基本上使用enumeratelineFragmentsForGlyphRange：usingBlock：循环遍历每一行.然后我使用enumerateEnclosingRectsForGlyphRange：withinSelectedGlyphRange：usingBlock：以确保当前行上的文本范围与行的范围匹配并具有相同的Y坐标.有时候这种方法有效,有时则不然.

似乎如果搜索文本靠近返回,它会突出显示突出显示. (y坐标).

在此屏幕截图中,“返回生成的字符范围”应突出显示.

似乎文本不在返回或空格附近,这可以正常工作：

我错过了什么吗？

更新：

我已经把问题缩小了一点,我相信enumeratelineFragmentsForGlyphRange：usingBlock：正在跳过返回的行.

解决方法 我找到了解决方案：

而不是使用enumerateEnclosingRectsForGlyphRange：我使用Nsstring方法enumerateSubstringsInRange：options：usingBlock：

我像往常一样枚举行片段,但是我没有尝试使用封闭的rect枚举方法,而是在构建图层的rect时枚举行上的每个字符.

-(voID)drawLayerForTextHighlightWithString:(Nsstring*)string {for (CALayer* eachLayer in [self highlightLayers]) {    [eachLayer removeFromSuperlayer];}NSLayoutManager* manager = [[self textVIEw]layoutManager];// Find the stringNSRange match = [[[self textVIEw]text]rangeOfString:string options:                 NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch | NSWIDthInsensitiveSearch];// Convert it to a glyph rangeNSRange matchingGlyphRange = [manager glyphRangeForCharacterRange:match actualCharacterRange:NulL];// Enumerate each line in that glyph range (this will fire for each line that the match spans)[manager enumeratelineFragmentsForGlyphRange:matchingGlyphRange usingBlock: ^(CGRect lineRect,BOol *stop) {     // currentRange uses NSIntersectionRange to return the range of the text that is on the current line     NSRange currentRange = NSIntersectionRange(lineRange,matchingGlyphRange);     // This rect will be built by enumerating each character in the line,and adding to it's wIDth     __block CGRect finallineRect = CGRectZero;     // Here we use enumerateSubstringsInRange:... to go through each glyph and build the final rect for the line     [[[self textVIEw]text]enumerateSubstringsInRange:currentRange options:NsstringEnumerationByComposedCharacterSequences usingBlock:      ^(Nsstring* substring,NSRange substringRange,NSRange enclostingRange,BOol* stop) {          // The range of the single glyph being enumerated          NSRange singleGlyphRange =  [manager glyphRangeForCharacterRange:substringRange actualCharacterRange:NulL];          // get the rect for that glyph          CGRect glyphRect = [manager boundingRectForGlyphRange:singleGlyphRange inTextContainer:textContainer];          // check to see if this is the first iteration,if not add the wIDth to the final rect for the line          if (CGRectEqualToRect(finallineRect,CGRectZero)) {              finallineRect = glyphRect;          } else {              finallineRect.size.wIDth += glyphRect.size.wIDth;          }      }];     // once we get the rect for the line,draw the layer     UIEdgeInsets textContainerInset = [[self textVIEw]textContainerInset];     finallineRect.origin.x += textContainerInset.@R_403_6823@;     finallineRect.origin.y += textContainerInset.top;     CALayer* roundRect = [CALayer layer];     [roundRect setFrame:finallineRect];     [roundRect setBounds:finallineRect];     [roundRect setCornerRadius:5.0f];     [roundRect setBackgroundcolor:[[UIcolor bluecolor]CGcolor]];     [roundRect setopacity:0.2f];     [roundRect setbordercolor:[[UIcolor blackcolor]CGcolor]];     [roundRect setborderWIDth:3.0f];     [roundRect setShadowcolor:[[UIcolor blackcolor]CGcolor]];     [roundRect setShadowOffset:CGSizeMake(20.0f,20.0f)];     [roundRect setShadowOpacity:1.0f];     [roundRect setShadowRadius:10.0f];     [[[self textVIEw]layer]addSublayer:roundRect];     [[self highlightLayers]addobject:roundRect];     // continues for each line }];

}

我还在进行多项比赛,一旦我开始工作,我就会更新代码.

总结

以上是内存溢出为你收集整理的ios – 使用CALayer突出显示跨越多行的UITextView中的文本全部内容，希望文章能够帮你解决ios – 使用CALayer突出显示跨越多行的UITextView中的文本所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。