将 IndexPath 传递给子视图
您好，我正在尝试将索引值从父视图传递到子视图，如下所示 //main.m
SubViewController *subViewController = [[SubViewController alloc] init];
subViewController.parentViewSelectedIndexPath = indexPath;
但是，当我尝试检查值是否已传递到子视图时，就像这样
//sub.m
- (void)viewDidLoad
{
//
NSLog(@"%@", parentViewSelectedIndexPath);
//
声明在侧面 子.h
//
@interface VehicleResultViewController : UITableViewController {
//
NSIndexPath *parentViewSelectedIndexPath;
//
@property (nonatomic, retain) NSIndexPath *parentViewSelectedIndexPath;
//
@end
//回答
子视图在获取传递给 is 的索引路径之前加载..所以我 必须使用稍后执行的方法 is(didselectricwatindexpath) 这打印出正确的索引路径 这是从主视图发送给它的。
它打印 (null) 到控制台..我做错了什么吗？
Hi I am trying to pass an indexvalue from my parent view to my subview like this
//main.m
SubViewController *subViewController = [[SubViewController alloc] init];
subViewController.parentViewSelectedIndexPath = indexPath;
However when I try to check to see if the value have been passed over to the subview like so
//sub.m
- (void)viewDidLoad
{
//
NSLog(@"%@", parentViewSelectedIndexPath);
//
decliration in side
sub.h
//
@interface VehicleResultViewController : UITableViewController {
//
NSIndexPath *parentViewSelectedIndexPath;
//
@property (nonatomic, retain) NSIndexPath *parentViewSelectedIndexPath;
//
@end
//Answer
subview loads before it gets the indexpath being passed to is.. so I
had to use a method that is executed later
i.s.(didselectrowatindexpath) this printed out the correct indexpath
that was sent to it from the main view.
it prints (null) to the console.. am I doing something wrong?
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添加一些 NSLog 来确定调用顺序，@Kevin 指出可以在设置属性之前调用 viewDidLoad 。
此外，如果每当实例化
subViewController时总是设置indexPath，那么最好以indexPath作为参数创建您自己的指定初始值设定项。在@Kevin 做出的情况下，这就是答案。Add some
NSLogs to determine the order of calls, @Kevin makes the point thatviewDidLoadmay be called prior to setting the property.Also if the
indexPathis always set wheneversubViewControlleris instantiated it is good practice to create your own designated initializer withindexPathas a parameter. In the case that @Kevin makes this is the answer.