如何实现loadView？

Question

我已经创建了一个名为GraphView的自定义视图。当视图加载时，我得到的只是一个空白的黑屏。下面是我的代码：

在GraphViewController.m中：

@synthesize graphView, graphModel;

- (void)loadView
{   
    GraphView *aGraphView = [[GraphView alloc] initWithFrame:CGRectZero];
    self.view = aGraphView;
    self.graphView = aGraphView;

    [aGraphView release];
}

我不确定为什么当我尝试在GraphViewController.m中实现loadView时，我只得到一个黑屏

Answer 1

我需要在loadView中将背景颜色设置为白色

- (void)loadView
{   
    GraphView *aGraphView = [[GraphView alloc] initWithFrame:CGRectZero];
    aGraphView.backgroundColor = [UIColor whiteColor];
    self.view = aGraphView;
    self.graphView = aGraphView;

    [aGraphView release];
}

Answer 2

您没有为GraphView对象设置框架：

GraphView *aGraphView = [[GraphView alloc] init];

UIView的指定初始化器是-initWithFrame:。执行如下操作(根据需要设置视图的大小/原点)：

GraphView *aGraphView = [[GraphView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];