1. NSString *str = [[NSString alloc] initWithFormat:@""];
   
2. str = [NSString stringWithFormat:@""];
   
3. [str release]; // 对象[[NSString alloc] initWithFormat:@""]的内存没有被释放

复制代码

1. NSString *str = [[NSString alloc] initWithFormat:@""];
   
2. str = [NSString stringWithFormat:@""];
   
3. [str release]; // 对象[[NSString alloc] initWithFormat:@""]的内存没有被释放

复制代码