获取系统字体

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    NSLog(@"--系统的所有字体--%@",[self getAllSystemFonts]);
    NSLog(@"--系统当前字体--%@",[self getCurrentFont]);

}
#pragma -mark -functions
//获得系统的所有字体
- (NSArray*)getAllSystemFonts;
{
    NSMutableArray *array = [[NSMutableArray alloc] init] ;
    NSArray* familys = [UIFont familyNames];
    
    for (id obj in familys) {
        NSArray* fonts = [UIFont fontNamesForFamilyName:obj];
        for (id font in fonts)
        {
            [array addObject:font];
        }
    }
    return array;
}
//获得系统的当前字体
- (UIFont*)getCurrentFont
{
    //判断系统字体的size，返回使用的字体。
    UIFont *font = [UIFont systemFontOfSize:[UIFont systemFontSize]];
    return font;
}