Self installed fonts have wrong line height in UILabel

I have installed two custom TTF fonts in my iPhone app (Cardo and New Athena Unicode). These are used in a multi-line UILabel, but for some reason the line height seems messed up: the lines have a lot of overlap.

What could cause this? Is it a bug in UILabel, or are the fonts not right? How can I edit or examine the co开发者_运维百科ntents of a TTF font file?

It's probably the fonts. Please try changing only the font used in your app. Use an included iOS font. If the label displays correctly by just changing the fonts used, it is the font's fault. If not, post the code so we can track down the problem.

You can edit fonts with a number of programs such as Fontlab, Fontographer, TypeTool, FontForge, etc. As BobC mentions in a comment, there may be licensing issues.