示例
Swift
let label = UILabel()
目标C
UILabel *label = [[UILabel alloc] init];
or
UILabel *label = [UILabel new]; // 调用alloc-init的便捷方法
更改默认字体的大小
迅速
label.font = UIFont.systemFontOfSize(17)
Swift3
label.font = UIFont.systemFont(ofSize: 17)
Objective-C
label.font = [UIFont systemFontOfSize:17];
使用特定的字体粗细
iOS8.2Swift
label.font = UIFont.systemFontOfSize(17, weight: UIFontWeightBold)
Swift3
label.font = UIFont.systemFont(ofSize: 17, weight: UIFontWeightBold)
Objective-C
label.font = [UIFont systemFontOfSize:17 weight:UIFontWeightBold];
