Question

我正在子类化UIView尝试从nib文件加载我在接口构建器中删除的视图。我在返回行上收到以下错误：

由于未捕获的异常'NSGenericException'而终止应用程序，原因：'此编码器要求从initWithCoder返回替换的对象：'

- (id)initWithCoder:(NSCoder *)aDecoder
{
    [super initWithCoder:aDecoder];
    NSArray *objects = [[NSBundle mainBundle]
                        loadNibNamed:@"MyView" 
                        owner:nil 
                        options:nil];
    if (self = [objects objectAtIndex:0])
    {
    }
    return [self retain];
}

Answer 1

你做的事很奇怪）

loadNibNamed:owner:options:将调用initWithCoder:从xib实例化您的视图。但是您从loadNibNamed:owner:options:致电initWithCoder:。无限递归？

要从xib加载视图，您可以执行下一步：

@implementation MyView

+ (MyView*) myView
{
  NSArray* array = [[NSBundle mainBundle] loadNibNamed:@"MyView" owner:nil options:nil];
  return [array objectAtIndex:0]; // assume that MyView is the only object in the xib
}

@end

Answer 2

而不是执行self = [objects objectAtIndex:0]，你应该遍历数组并确保获得正确的对象，例如：

for (id object in objects) {
    if ([object isKindOfClass:[YourClassName class]])
        self = (YourClassName*)object;
}

那就是说，我总是这样做了一层并将参考文献从UIViewController中拉出来。这打破了抽象层，因为只想使用视图的类需要知道Nib的内容：

UIViewController *vc = [[UIViewController alloc] initWithNibName:@"MyView" bundle:nil];
YourClassName* view = (YourClassName*)vc.view;
[vc release];

iPhone - 从nib文件加载UIView？

2 个答案: