@property (nonatomic, assign) 是什么?
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assign: 简单赋值,不更改索引计数(Reference Counting)。copy: 建立一个索引计数为1的对象,然后释放旧对象retain:释放旧的对象,将旧对象的值赋予输入对象,再提高输入对象的索引计数为1retain的实际语法为:- (void)setName:(NSString *)newName {if (name != newName) {[name release];name = [newName retain];// name’s retain count has been bumped up by 1}}说了那么麻烦,其实接下来的话最重要:使用assign: 对基础数据类型 (NSInteger,CGFloat)和C数据类型(int, float, double, char, 等等)使用copy: 对NSString使用retain: 对其他NSObject和其子类atomic是Objc使用的一种线程保护技术,基本上来讲,是防止在写未完成的时候被另外一个线程读取,造成数据错误。而这种机制是耗费系统资源的,所以在iPhone这种小型设备上,如果没有使用多线程间的通讯编程,那么nonatomic是一个非常好的选择。
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