关键字nonnull和nullable - ShenYj/ShenYj.github.io GitHub Wiki

关键字 nonnull和nullable

iOS 9新增关键字: 用于修饰属性或者方法的参数、方法的返回值

  • nonnull不可为空,等同于_Nonnull和__nonnull

    e.g.

    @property (nonatomic, strong, nonnull) UIView *view;
@property (nonatomic, strong) UIView *_Nonnull view;
@property (nonatomic, strong) UIView *__nonnull view;

  • nullable可为空,等同于_Nullable和__nullable

    e.g.

    @property (nonatomic, strong, nullable) UIView *view;
@property (nonatomic, strong) UIView *_Nullable view;
@property (nonatomic, strong) UIView *__nullable view;

  • null_resettable setter方法可传空,getter方法不为空

  • _Null_unspecified 不确认是否为空

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