CGRect r = [aString boundingRectWithSize:CGSizeMake([[UIScreen mainScreen] bounds].size.width - 20, 20000) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14.0f]} context:nil];
CGRect r = [aString boundingRectWithSize:CGSizeMake([[UIScreen mainScreen] bounds].size.width - 20, 20000) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14.0f]} context:nil];
本文标题：iOS Waring:'sizeWithFont:constra
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