Messing with UIFont in +(void)initialize is bad

[marksands]

See here.

The problem

When running my unit tests, the + (void)initialize method gets called and signals a HALT. The offending selector is [UIFont boldSystemFontOfSize:], which tells us that it can't deduce the device type when running from Terminal:

Unknown Device Type. Using UIUserInterfaceIdiomPad based on screen size

The offending code

+ (void)initialize
{
    if (self == [BlockAlertView class])
    {
        background = [UIImage imageNamed:kAlertViewBackground];
        background = [[background stretchableImageWithLeftCapWidth:0 topCapHeight:kAlertViewBackgroundCapHeight] retain];

        backgroundlandscape = [UIImage imageNamed:kAlertViewBackgroundLandscape];
        backgroundlandscape = [[backgroundlandscape stretchableImageWithLeftCapWidth:0 topCapHeight:kAlertViewBackgroundCapHeight] retain];

        titleFont = [[UIFont boldSystemFontOfSize:20] retain];
        messageFont = [[UIFont systemFontOfSize:18] retain];
        buttonFont = [[UIFont boldSystemFontOfSize:18] retain];
    }
}

The solution

+ (void)initialize
{
    if (self == [BlockAlertView class])
    {
        background = [UIImage imageNamed:kAlertViewBackground];
        background = [[background stretchableImageWithLeftCapWidth:0 topCapHeight:kAlertViewBackgroundCapHeight] retain];

        backgroundlandscape = [UIImage imageNamed:kAlertViewBackgroundLandscape];
        backgroundlandscape = [[backgroundlandscape stretchableImageWithLeftCapWidth:0 topCapHeight:kAlertViewBackgroundCapHeight] retain];        
    }
}