Replacement for deprecated sizeWithFont: in iOS 7?

Question

In iOS 7, sizeWithFont: is now deprecated. How do I now pass in the UIFont object into the replacement method sizeWithAttributes:?

Answer 1

In iOS7 I needed the logic to return the correct height for the tableview:heightForRowAtIndexPath method, but the sizeWithAttributes always returns the same height regardless of the string length because it doesn't know that it is going to be put in a fixed width table cell. I found this works great for me and calculates the correct height taking in consideration the width for the table cell! This is based on Mr. T's answer above.

NSString *text = @"The text that I want to wrap in a table cell."

CGFloat width = tableView.frame.size.width - 15 - 30 - 15;  //tableView width - left border width - accessory indicator - right border width
UIFont *font = [UIFont systemFontOfSize:17];
NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:@{NSFontAttributeName: font}];
CGRect rect = [attributedText boundingRectWithSize:(CGSize){width, CGFLOAT_MAX}
                                           options:NSStringDrawingUsesLineFragmentOrigin
                                           context:nil];
CGSize size = rect.size;
size.height = ceilf(size.height);
size.width  = ceilf(size.width);
return size.height + 15;  //Add a little more padding for big thumbs and the detailText label

Answer 2

You can still use sizeWithFont. but, in iOS >= 7.0 method cause crashing if the string contains leading and trailing spaces or end lines \n.

Trimming text before using it

label.text = [label.text stringByTrimmingCharactersInSet:
             [NSCharacterSet whitespaceAndNewlineCharacterSet]];

That's also may apply to sizeWithAttributes and [label sizeToFit].

also, whenever you have nsstringdrawingtextstorage message sent to deallocated instance in iOS 7.0 device it deals with this.

Answer 3

Use sizeWithAttributes: instead, which now takes an NSDictionary. Pass in the pair with key UITextAttributeFont and your font object like this:

CGRect rawRect = {};
rawRect.size = [string sizeWithAttributes: @{
    NSFontAttributeName: [UIFont systemFontOfSize:17.0f],
}];

// Values are fractional -- you should take the ceil to get equivalent values
CGSize adjustedSize = CGRectIntegral(rawRect).size;

Answer 4

I created a category to handle this problem, here it is :

#import "NSString+StringSizeWithFont.h"

@implementation NSString (StringSizeWithFont)

- (CGSize) sizeWithMyFont:(UIFont *)fontToUse
{
    if ([self respondsToSelector:@selector(sizeWithAttributes:)])
    {
        NSDictionary* attribs = @{NSFontAttributeName:fontToUse};
        return ([self sizeWithAttributes:attribs]);
    }
    return ([self sizeWithFont:fontToUse]);
}

This way you only have to find/replace sizeWithFont: with sizeWithMyFont: and you're good to go.

Answer 5

CGSize maximumLabelSize = CGSizeMake(label.frame.size.width, FLT_MAX);
CGSize expectedLabelSize = [label sizeThatFits:maximumLabelSize];
float heightUse = expectedLabelSize.height;

Answer 6

Try this syntax:

NSAttributedString *attributedText =
    [[NSAttributedString alloc] initWithString:text 
                                    attributes:@{NSFontAttributeName: font}];