UIButton custom font vertical alignment

问题

I\'ve got a UIButton which uses a custom font, which is set when my view loads:

- (void)viewDidLoad
{
    [super viewDidLoad];    
    self.searchButton.titleLabel.font = [UIFont fontWithName: @\"FONTNAME\" size: 15.0 ];
}

The problem I\'ve got is that the font is appearing to float up of the center line. If I comment out this line, the default font appears vertically centered fine. But changing to the custom font breaks the vertical alignment.

I\'m getting the same issue on a Table Cell with a custom font too.

Do I need to tell the view somewhere that the custom font is not as tall as other fonts?

EDIT: I\'ve just realized that the font I\'m using is a Windows TrueType Font. I can use it fine in TextEdit on the Mac, only a problem with the alignment in my App

回答1:

A similar problem was discussed at Custom installed font not displayed correctly in UILabel. There was no solution given.

Here's the solution that worked for my custom font which had the same issue in UILabel, UIButton and such. The problem with the font turned out to be the fact that its ascender property was too small compared to the value of system fonts. Ascender is a vertical whitespace above font's characters. To fix your font you will have to download Apple Font Tool Suite command line utilities. Then take your font and do the following:

~$ ftxdumperfuser -t hhea -A d Bold.ttf

This will create Bold.hhea.xml. Open it with a text editor and increase the value of ascender attribute. You will have to experiment a little to find out the exact value that works best for you. In my case I changed it from 750 to 1200. Then run the utility again with the following command line to merge your changes back into the ttf file:

~$ ftxdumperfuser -t hhea -A f Bold.ttf

Then just use the resulting ttf font in your app.

OS X El Capitan

The Apple Font Tool Suite Installer doesn't work anymore on OSX El Capitan because of SIP because it tries to install the binary files into a protected directory. You have to manually extract ftxdumperfuser. First copy the pkg from the dmg to a local directory afterwards unpack the OS X Font Tools.pkg with

~$ xar -xf OS\ X\ Font\ Tools.pkg

Now navigate into the folder fontTools.pkg with

~$ cd fontTools.pkg/

Extract payload with

~$ cat Payload | gunzip -dc | cpio -i

Now the ftxdumperfuser binary is in your current folder. You could move it to /usr/local/bin/ so that you can use it in every folder inside of the terminal application with the following.

~$ mv ftxdumperfuser /usr/local/bin/

回答2:

I solved the problem adjusting the top content (not the title!) inset.

For example: button.contentEdgeInsets = UIEdgeInsetsMake(10.0, 0.0, 0.0, 0.0);

Good luck!

回答3:

I think this is the best answer. no playing with ascender, numberOfHMetrics etc... just import-export by Glyphs application and Job done. Thanks to this answer: https://stackoverflow.com/a/16798036/1207684

回答4:

Not sure if this will help as it may depend on your font, but it could be that your baseline is misaligned.

self.searchButton.titleLabel.baselineAdjustment = 
    UIBaselineAdjustmentAlignCenters;

回答5:

You can try this out in Interface Builder. Here is a snapshot of how to do it -

As you can see trying to do this in IB has its own benefits.

回答6:

NOTE : There clearly is a better answer than this (the one with hundreds of up votes above)

I can't find a real answer to this, other than edit the font file. Which I don't know how to do and didn't have time, so I just made my pictures narrower, and adjusted the cell to make it look like it was aligned properly.

A dirty little hack I suppose, but it works and it's fine.

This was the only font that caused a problem, so the issue must be with the font file.

It wasn't actually me that concluded this, it was another SO post, but I can't find it anywhere, if I come across it again I'll stick it in the comments.

来源：https://stackoverflow.com/questions/7535498/uibutton-custom-font-vertical-alignment