iphone - 将 IndexPath 传递给 subview

Question

您好，我正在尝试将索引值从我的父 View 传递到我的 subview ，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像这样传递给 subview 时

//子.m

- (void)viewDidLoad
{
//
NSLog(@"%@", parentViewSelectedIndexPath);
//

边上的声明子.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.

它向控制台打印 (null)。我做错了什么吗？

Answer 1

添加一些 NSLog 以确定调用顺序，@Kevin 指出 viewDidLoad 可以在设置属性之前调用。

此外，如果每次实例化 subViewController 时始终设置 indexPath，则最好使用 indexPath 作为参数创建您自己的指定初始化程序.在@Kevin 提出的情况下，这就是答案。