///计算字符串宽度
- (CGFloat)widthWithString:(NSString*)string font:(UIFont*)font {
NSDictionary*attrs =@{NSFontAttributeName: font};
return[stringboundingRectWithSize:CGSizeMake(0,0)options:NSStringDrawingUsesLineFragmentOriginattributes:attrscontext:nil].size.width;
}
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