There are several steps needed before you can successfully use your custom fonts in your iOS app.

Step 1:

Drag your fonts into XCode project, and make sure each of them is included in the target


Step 2:

Double check that your fonts are in the Resource Bundle
Select your target -> Build Phases -> Copy Bundle Resources

Step 3:

Add your fonts to application plist

Step 4:

Check the fonts names
The font file downloaded from internet might be differ from the font name itself. You can check the font name with following codes:
Objective-C

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for (NSString * fontFamilyName in UIFont.familyNames) {
    NSLog(@"%@", fontFamilyName);
    for (NSString * fontName in [UIFont fontNamesForFamilyName:fontFamilyName]) {
        NSLog(@"|-%@", fontName);
    }
}

Swift

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for family in UIFont.familyNames.sorted() {
    let names = UIFont.fontNames(forFamilyName: family)
    print("Family: \(family) Font names: \(names)")
}

Step 5:

Finally, use your custom fonts.