ios界面iVar vs属性 [英] ios interface iVar vs Property

问题描述

在.h文件中，两者之间有什么区别

In an .h file, what is the difference between:

@interface ViewController : UIViewController
@property (strong, nonatomic) UIView* myView;

还有

@interface ViewController : UIViewController{
    UIView* myView;
}

推荐答案

主要区别是@property对其他对象可见，并且可以使用您的类的实例对其进行访问.

The main difference is that a @property is visible to other objects, and can be accessed by these using an instance of your class.

您可以在实现文件中使用@synthesize来自动实现实现中的degetter setter函数定义.

You can use @synthesize in your implementation file to automate definition de getter setter functions in your implementation.

更新(遵循@ Graham Lee 的建议)

根据实例变量(@protected/@private/@public)的可见性说明符，可以在实现文件，子类或其他类中使用ivar.隐式值是@protected，因此在您的示例中，实现文件和子类将可见该值.

According to the visibility specifier for your instance variable (@protected / @private / @public) , the ivar can be used in your implementation file, subclasses or other classes. The implicit value is @protected, so in your example it will be visible to your implementation file and subclasses.

这篇关于ios界面iVar vs属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！