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方法1(系统):CGSize declabesize = [_questionDecLabel.text boundingRectWithSize:CGSizeMake(CGRectGetWidth(_questionDecLabel.frame), MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:_questionDecLabel.font} context:nil].size;
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原文地址:http://www.cnblogs.com/wq-gril/p/4439775.html