we all know NSString method sizeWithFont

[@"abacfe" sizeWithFont:[UIFont systemFontOfSize:11] constrainedToSize:maximumLabelSize lineBreakMode:NSLineBreakByCharWrapping];

deprecated in iOS 7. So here is the replacement of this method.

CGSize maximumLabelSize = CGSizeMake(245, FLT_MAX);
NSStringDrawingOptions options = NSStringDrawingTruncatesLastVisibleLine |
NSStringDrawingUsesLineFragmentOrigin;

NSDictionary *attributDict = @{NSFontAttributeName: [UIFont systemFontOfSize:11]};
CGRect rectsize = [@"abcedef" boundingRectWithSize:maximumLabelSize options:options attributes:attributDict context:nil];

if you want to get the height or widht use

float height=ceilf(rectsize.height);
float width=ceilf(rectsize.width);