计算固定 UIView 中文本字段的正确高度和宽度(格式化文本,包括文本大小、文本颜色、文本字体)的最佳方法是什么,包括自动换行等
下图中的文字未右对齐Check the Image
下图中的文本未正确显示check the image
我正在使用以下代码计算图像的高度和宽度
NSString* text=[textField stringValue];
NSDictionary *attributes;
NSTextView* textView =[[NSTextView alloc] init];
[textView setString:text];
attributes = @{NSFontAttributeName : [NSFont fontWithName:fontName size:fontValue], NSForegroundColorAttributeName : [NSColor colorWithCalibratedRed:redValueTextColor green:GreenValueTextColor blue:blueValueTextColor alpha:1], NSBackgroundColorAttributeName : [NSColor colorWithCalibratedRed:redValueTextBackgroundColor green:GreenValueTextBackgroundColor blue:blueValueTextBackgroundColor alpha:1]};
textView.backgroundColor=[NSColor colorWithCalibratedRed:redValueTextBackgroundColor green:GreenValueTextBackgroundColor blue:blueValueTextBackgroundColor alpha:1];
NSInteger maxWidth = 600;
NSInteger maxHeight = 20000;
CGSize constraint = CGSizeMake(maxWidth, maxHeight);
NSRect newBounds = [text boundingRectWithSize:constraint options:NSLineBreakByCharWrapping|NSStringDrawingUsesFontLeading attributes:attributes];
textView.frame = NSMakeRect(textView.frame.origin.x, textView.frame.origin.y, newBounds.size.width, newBounds.size.height);
textView =[NSColor colorWithCalibratedRed:redValueTextColor green:GreenValueTextColor blue:blueValueTextColor alpha:1];
[textView setFont:[NSFont fontWithName:fontName size:fontValue]];
最佳答案
核心文本解决方案(注意,如果需要,maxWidth 允许换行):
(CGSize)sizeForText:(NSAttributedString *)string maxWidth:(CGFloat)width
{
CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedString((__bridge CFAttributedStringRef)string);
CFIndex offset = 0, length;
CGFloat y = 0, lineHeight;
do {
length = CTTypesetterSuggestLineBreak(typesetter, offset, width);
CTLineRef line = CTTypesetterCreateLine(typesetter, CFRangeMake(offset, length));
CGFloat ascent, descent, leading;
CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CFRelease(line);
offset += length;
ascent = roundf(ascent);
descent = roundf(descent);
leading = roundf(leading);
lineHeight = ascent + descent + leading;
lineHeight = lineHeight + ((leading > 0) ? 0 : roundf(0.2*lineHeight)); //add 20% space
y += lineHeight;
} while (offset < [string length]);
CFRelease(typesetter);
return CGSizeMake(width, y);
}
关于macos - 根据xcode中的文本、字体、文本颜色计算高度和宽度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30444290/