iOS中自动释放问题？(2)

来源：未知责任编辑：责任编辑发表时间:2014-01-26 21:59　点击:次

    //path成员变量，文件路径－自动释放对象
    path=[docstr stringByAppendingPathComponent:@"1.png"];
    //调用方法，path做参数
    [self saveData:path];
    //分割线
-(void)saveData:(NSString *)filePath
{
    //data读取内容
    NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"IMG_1340" ofType:@"PNG"];
    NSData *data= [NSData dataWithContentsOfFile:imagePath];
    //用path去保存data
    [data writeToFile:filePath atomically:NO];
} 例子2,这么写，也没问题，文件能保存。或者[self saveData:path]; 改成[self saveData]; saveData方法不传入参数，用成员变量path代替filePath的作用，这么写，也没问题。[html] view plaincopyprint?    //例子3
    NSArray*patharray=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString*docstr=[patharray objectAtIndex:0];
    //path成员变量，文件路径－自动释放对象
    path=[docstr stringByAppendingPathComponent:@"1.png"];

    //创建按钮
    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0.0, 0.0, 100, 100)];
    button.backgroundColor = [UIColor redColor];
    [button addTarget:self action:@selector(saveData) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
-(void)saveData
{
    //data读取内容
    NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"IMG_1340" ofType:@"PNG"];
    NSData *data= [NSData dataWithContentsOfFile:imagePath];
    //用path去保存data
    [data writeToFile:path atomically:NO];
}

    //例子3
    NSArray*patharray=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString*docstr=[patharray objectAtIndex:0];
    //path成员变量，文件路径－自动释放对象
    path=[docstr stringByAppendingPathComponent:@"1.png"];

    //创建按钮
    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0.0, 0.0, 100, 100)];
    button.backgroundColor = [UIColor redColor];
    [button addTarget:self action:@selector(saveData) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];