可以通过遍历UIFont中的familyNames得到所有iOS设备的字体

for (NSString *family in [UIFont familyNames]) 
{ 
    NSLog(@"%@", family); 
    for(NSString *font in [UIFont fontNamesForFamilyName:family]) 
    { 
        NSLog(@"\t%@",font); 
    } 
}