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).
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 string
NSRange match = [[[self textView]text]rangeOfString:string options:
NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch | NSWidthInsensitiveSearch];
// Convert it to a glyph range
NSRange 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.left;
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.
