直接设置属性和使用其setter之间的区别? [英] Difference between setting a property directly and using its setter?

问题描述

这两者有什么区别?

• self.view.color = [UIColor redColor];
• [self.view setColor:[UIColor redColor]];

• self.view.color = [UIColor redColor];
• [self.view setColor:[UIColor redColor]];

推荐答案

没事.

• 使用self.view.color = ...隐式调用属性的setter.
• 使用[self.view setColor:...]可以显式调用设置器.

• With self.view.color = ... the property's setter in called implicitly.
• With [self.view setColor:...] you call the setter explicitly.

更多详细信息:UIView具有类似以下内容的color属性:

More in detail: UIView has a color property something like:

@property (nonatomic, strong) UIColor* color;

在Objective-C中，这会自动定义基础ivar _color，并为setter和getter生成代码. (生成的代码取决于修饰符nonatomic，...您指定.)

In Objective-C this automatically defines an underlying ivar _color, and generates code for the setter and getter. (What code is generated depends on the modifiers nonatomic, ... you specify.)

当您键入self.view.color = ...时，编译器会看到您的color是属性，并在内部将其替换为[self.view setColor:...].

When you type self.view.color = ... the compiler sees that your color is a property, and internally replaces it with [self.view setColor:...].

这篇关于直接设置属性和使用其setter之间的区别?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！