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计算NSAttributedString字符串size
/**
*return 动态返回字符串size大小
*
*@param aString 字符串
*@param width指定宽度
*@param height指定宽度
*
*@return CGSize
*/
- (CGSize)getStringRect:(NSAttributedString *)aString width:(CGFloat)width height:(CGFloat)height
{
CGSize size = CGSizeZero;
NSMutableAttributedString *atrString = [[NSMutableAttributedString alloc] initWithAttributedString:aString];
NSRange range = NSMakeRange(0, atrString.length);
//获取指定位置上的属性信息，并返回与指定位置属性相同并且连续的字符串的范围信息。
NSDictionary* dic = [atrString attributesAtIndex:0 effectiveRange:&range];
//不存在段落属性，则存入默认值
NSMutableParagraphStyle *paragraphStyle = dic[NSParagraphStyleAttributeName];
if (!paragraphStyle || nil == paragraphStyle) {
paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineSpacing = 0.0;
//增加行高
paragraphStyle.headIndent = 0;
//头部缩进，相当于左padding
paragraphStyle.tailIndent = 0;
//相当于右padding
paragraphStyle.lineHeightMultiple = 0;
//行间距是多少倍
paragraphStyle.alignment = NSTextAlignmentLeft;
//对齐方式
paragraphStyle.firstLineHeadIndent = 0;
//首行头缩进
paragraphStyle.paragraphSpacing = 0;
//段落后面的间距
paragraphStyle.paragraphSpacingBefore = 0;
//段落之前的间距
[atrString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:range];
}//设置默认字体属性
UIFont *font = dic[NSFontAttributeName];
if (!font || nil == font) {
font = [UIFont fontWithName:@"HelveticaNeue" size:12.0];
[atrString addAttribute:NSFontAttributeName value:font range:range];
}NSMutableDictionary *attDic = [NSMutableDictionary dictionaryWithDictionary:dic];
[attDic setObject:font forKey:NSFontAttributeName];
[attDic setObject:paragraphStyle forKey:NSParagraphStyleAttributeName];
CGSize strSize = [[aString string] boundingRectWithSize:CGSizeMake(width, height)
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:attDic
context:nil].size;
size = CGSizeMake(strSize.width, strSize.height);
return size;
}
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