CGRect用于多行文本的选定UITextRange调整? [英] CGRect for selected UITextRange adjustment for multiline text?
问题描述
我使用了此答案，以便为特定范围的文本创建CGRect.
I've used this answer in order to create a CGRect for a certain range of text.
在此UITextView中，我将其设置为attributedText(因此，我有一堆具有不同字形大小的样式化文本).
In this UITextView I've set it's attributedText (so I've got a bunch of styled text with varying glyph sizes).
这对于左对齐的第一行文本非常有用，但是在使用NSTextAlignmentJustified或NSTextAlignmentCenter时，它会产生一些非常奇怪的结果.
This works great for the first line of text that's left aligned, but it has some really strange results when working with NSTextAlignmentJustified or NSTextAlignmentCenter.
当换行或\n换行时(有时)，换行也无法正确计算.
It also doesn't calculate properly when the lines wrap around or (sometimes) if there are \n line breaks.
我得到这样的东西(这是居中对齐的):
I get stuff like this (this is center aligned):
相反，我期望这样:
此代码有一个\n换行符-前两个代码位已成功突出显示，但最后一个more code for you to see不是因为x，y计算中未考虑文本换行.
This one has a \n line break - the first two code bits were highlighted successfully, but the last one more code for you to see was not because the text wrapping isn't factored into the x,y calculations.
- (void)formatMarkdownCodeBlockWithAttributes:(NSDictionary *)attributesDict
withHighlightProperties:(NSDictionary *)highlightProperties
forFontSize:(CGFloat)pointSize
{
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"`.+?`" options:NO error:nil];
NSArray *matchesArray = [regex matchesInString:[self.attributedString string] options:NO range:NSMakeRange(0, self.attributedString.length)];
for (NSTextCheckingResult *match in matchesArray)
{
NSRange range = [match range];
if (range.location != NSNotFound) {
self.textView.attributedText = self.attributedString;
CGRect codeRect = [self frameOfTextRange:range forString:[[self.attributedString string] substringWithRange:range] forFontSize:pointSize];
UIView *highlightView = [[UIView alloc] initWithFrame:codeRect];
highlightView.layer.cornerRadius = 4;
highlightView.layer.borderWidth = 1;
highlightView.backgroundColor = [highlightProperties valueForKey:@"backgroundColor"];
highlightView.layer.borderColor = [[highlightProperties valueForKey:@"borderColor"] CGColor];
[self.contentView insertSubview:highlightView atIndex:0];
[self.attributedString addAttributes:attributesDict range:range];
//strip first and last `
[[self.attributedString mutableString] replaceOccurrencesOfString:@"(^`|`$)" withString:@" " options:NSRegularExpressionSearch range:range];
}
}
}
- (CGRect)frameOfTextRange:(NSRange)range forString:(NSString *)string forFontSize:(CGFloat)pointSize
{
self.textView.selectedRange = range;
UITextRange *textRange = [self.textView selectedTextRange];
CGRect rect = [self.textView firstRectForRange:textRange];
//These three lines are a workaround for getting the correct width of the string since I'm always using the monospaced Menlo font.
rect.size.width = ((pointSize / 1.65) * string.length) - 4;
rect.origin.x+=2;
rect.origin.y+=2;
return rect;
}
哦，如果需要的话，这是我在玩的字符串:
Oh, and in case you want it, here's the string I'm playing with:
*This* is **awesome** @mention `code` more \n `code and code` #hashtag [markdown](http://google.com) __and__ @mention2 {#FFFFFF|colored text} This**will also** work but ** will not ** **work** Also, some `more code for you to see`
注意:请不要建议我使用TTTAttributedLabel或OHAttributedLabel.
Note: Please don't suggest I use TTTAttributedLabel or OHAttributedLabel.
推荐答案
我认为您的所有问题都是由于指令顺序不正确造成的.
I think all your problems are because of incorrect order of instructions.
您必须
- 设置文字匹配度
- 找到所需的子字符串并为其添加特定属性
- 然后仅使用子视图突出显示字符串.
在这种情况下，您也不需要使用获得正确宽度的字符串的解决方法，因为我一直使用等宽的Menlo字体."
Also you will not need to use "a workaround for getting the correct width of the string since I'm always using the monospaced Menlo font" in such a case.
为了使代码更易于理解，我对代码进行了一些简化.
I have simplified your code a little to make it more understandable.
结果:
- (void)viewDidLoad
{
[super viewDidLoad];
NSDictionary *basicAttributes = @{ NSFontAttributeName : [UIFont boldSystemFontOfSize:18],
NSForegroundColorAttributeName : [UIColor blackColor] };
NSDictionary *attributes = @{ NSFontAttributeName : [UIFont systemFontOfSize:15],
NSForegroundColorAttributeName : [UIColor darkGrayColor]};
_textView.attributedText = [[NSAttributedString alloc] initWithString:
@"*This* is **awesome** @mention `code` more \n `code and code` #hashtag [markdown](http://google.com) __and__ @mention2 {#FFFFFF|colored text} This**will also** work but ** will not ** **work** Also, some `more code for you to see`" attributes:attributes];
_textView.textAlignment = NSTextAlignmentCenter;
[self formatMarkdownCodeBlockWithAttributes:basicAttributes];
}
- (void)formatMarkdownCodeBlockWithAttributes:(NSDictionary *)attributesDict
{
NSMutableString *theString = [_textView.attributedText.string mutableCopy];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"`.+?`" options:NO error:nil];
NSArray *matchesArray = [regex matchesInString:theString options:NO range:NSMakeRange(0, theString.length)];
NSMutableAttributedString *theAttributedString = [_textView.attributedText mutableCopy];
for (NSTextCheckingResult *match in matchesArray)
{
NSRange range = [match range];
if (range.location != NSNotFound) {
[theAttributedString addAttributes:attributesDict range:range];
}
}
_textView.attributedText = theAttributedString;
for (NSTextCheckingResult *match in matchesArray)
{
NSRange range = [match range];
if (range.location != NSNotFound) {
CGRect codeRect = [self frameOfTextRange:range];
UIView *highlightView = [[UIView alloc] initWithFrame:codeRect];
highlightView.layer.cornerRadius = 4;
highlightView.layer.borderWidth = 1;
highlightView.backgroundColor = [UIColor yellowColor];
highlightView.layer.borderColor = [[UIColor redColor] CGColor];
[_textView insertSubview:highlightView atIndex:0];
}
}
}
- (CGRect)frameOfTextRange:(NSRange)range
{
self.textView.selectedRange = range;
UITextRange *textRange = [self.textView selectedTextRange];
CGRect rect = [self.textView firstRectForRange:textRange];
return rect;
}
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