Objective-C中属性修饰符copy,retain,assign,readonly,readwrite,nonatomic
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Problem:
在Objective-C中,除了定义类的实例变量(instance variable)之外,还可以定义其属性。属性其实可以理解为类的一种变量,只不过声明为属性,可以使用@synthesize语法来自动合成变量的存取方法(getter and setter methods)。属性的定义类似于:
@interface ClassA
@property (nonatomic, retain) UIButton *button;
@property (nonatomic, assign) int number;
@end
其中属性前面括号里面的为属性的修饰符,有atomic、nonatominc、readonly、readwrite、copy、retain、assign等(在ARC中,retain、assign分别为strong、weak)。那么这些修饰符怎么去理解,它们又有什么区别呢?
Solution:
Discussion:
(remain summarize) 0 0
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