解析:Program received signal: “EXC_BAD_ACCESS"
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在练习时,有这么段代码:
CALayer *sublayer = [CALayer layer];
sublayer.backgroundColor = [UIColor blueColor].CGColor;
sublayer.shadowOffset = CGSizeMake(0, 3);
sublayer.shadowRadius = 5.0;
sublayer.shadowColor = [UIColor blackColor].CGColor;
sublayer.shadowOpacity = 0.8;
sublayer.frame = CGRectMake(30, 30, 128, 192);
[self.view.layer addSublayer:sublayer];
由于被书上的内存泄露吓唬住了,所以又在最后追加了[sublayer release];来释放内存而在程序调试运行退出时碰到了Program received signal: “EXC_BAD_ACCESS" 错误。经网络搜索搞清楚了这个错误产生的几个原因:
1、访问受保护或者不存在的内存空间,导致返回了一个错误的指针;
2、访问未进行内存分配或初始化的内存空间;
3、在对象被释放后仍然采用原来的指针进行访问;
4、采用了[object release]释放对象,但其实对象并未采用 alloc/copy/retain 等形式进行内存分配;(这是我此次错误的原因)
5、其他不合法的内存访问方式;
总之,对于常见的EXEC_BAD_ACCESS,EXC_BAD_INSTRUCTION,错误,一般都是因为访问已经被release的对象造成的。尤其是在一个线程中访问另外一个线程的autorelease库中的对象,尤其要注意此类问题。
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