Lvalue需要作为赋值的左操作数

Question

您好我在xcode中得到"Lvalue required as assignment operand of assignment"错误.为什么？这是我的代码(window1/2是UIViewController):

- (void)loadView
{

    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0,320,460)];
    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0,0,640,460)];


    self.window1 = [TweetViewController alloc];
    self.window2 = [InfoViewController alloc];


    [contentView addSubview:self.window1.view];
    self.window2.view.frame.origin.x = 320; //HERE IS THE ERROR!!
    [contentView addSubview:self.window2.view];


    [scrollView addSubview:contentView];
    scrollView.contentSize = contentView.frame.size;


    scrollView.pagingEnabled = YES;


    self.view = scrollView;


    [contentView release];
    [scrollView release];
}

谢谢你的帮助.

Answer 1

该部件self.window2.view.frame将为您留下一个吸气剂,而不是实际伸入并抓住内部框架CGRect.您需要做的是进行CGRect更改,然后将其重新设置到视图中.

CGRect f = self.window2.view.frame; // calls the getter
f.origin.x = 320;
self.window2.view.frame = f; // calls the setter