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  • IOSsynthesize和dynamic的异同

    一、SDK中描述是在声明property的时候,有2个选择
    1:通过@synthesize 指令告诉编译器在编译期间产生getter/setter方法。
    2:通过@dynamic指令,自己实现方法。
    有些存取在运行时动态创建CoreDataNSManagedObject使用的某些如果你想这些情况声明和使用属性,但要避免缺少方法在编译时警告可以使用@dynamic动态指令不是@synthesize合成指令例如
    @interface Demo : NSManagedObject {
    }
    @property (retain) NSString* test;
    @end

    @implementation Demo
    @dynamic test;
    @end

    二、

    @synthesize will generate getter and setter methods for your property. @dynamic just tells the compiler that the getter and setter methods are implemented not by the class itself but somewhere else (like the superclass)

    Uses for @dynamic are e.g. with subclasses of NSManagedObject (CoreData) or when you want to create an outlet for a property defined by a superclass that was not defined as an outlet:

    Super class:

    @property(nonatomic, retain)NSButton*someButton;
    ...
    @synthesize someButton;

    Subclass:

    @property(nonatomic, retain)IBOutletNSButton*someButton;
    ...
    @dynamic someButton;
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  • 原文地址:https://www.cnblogs.com/tx8899/p/2538632.html
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