ios字体样式

ios支持多种字体样式，以下代码获取ios支持的字体样式：

        NSArray *familyNames = [UIFont familyNames];
        
        for( NSString *familyName in familyNames ){
            
            NSLog(@"Family: %@",familyName);
            
            NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
            for( NSString *fontName in fontNames ){
                NSLog(@"Font: %@",fontName);
            }
            
        }

加粗;

[UILabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];

加粗并且倾斜

[UILabel setFont:[UIFont fontWithName:@"Helvetica-BoldOblique" size:20]];