ios - 从 TableView 到标签的数组数据

Question

我有一个 tableview 设置来显示来自 sqlite 数据库的数据，现在我想做的是设置一个 View ，以在用户单击表格单元格时显示来自所述数据库的更多信息。

根据我目前所读的内容，我的理解是这主要是在 TableView Controller 内的 prepareForSegue 方法中完成的？

无论如何，经过大量谷歌搜索后，我从 AppCoda 教程中得到了这个 (link) ...

 if([segue.identifier isEqualToString:@"pushToMountainInfo"]) {
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    UINavigationController *nav = segue.destinationViewController;
    MountainInformation *destViewController = [nav.viewControllers objectAtIndex:0];
    MountainsObject *mountain = [self.mountains objectAtIndex:indexPath.row];
    destViewController.nameLabel = mountain.name;
    NSLog(@"%@", mountain.name);
}

我将 NSLog 放在那里进行测试，它确实将山的名称输出到日志中，但当我运行该应用程序时标签仍为空白。

有人可以帮忙吗？ 谢谢..!

Answer 1

可以稍微缩短一下你的代码..

 if([segue.identifier isEqualToString:@"pushToMountainInfo"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];

MountainInformation *destViewController = [segue destinationViewController];// do this only if your segue is connected to the next one from previous, or else let it stay as you have, only change the later part
MountainsObject *mountain = [self.mountains objectAtIndex:indexPath.row];
destViewController.myMountain = mountain.name;
NSLog(@"%@", mountain.name);
}

现在在 MountainInformation.h 文件中创建一个属性

 @property (nonatomic, strong) NSString* myMountain;

现在您的属性已设置为您要设置的名称。 现在在MountainInformation.m中的viewDidLoad中

-(viewDidLoad){
self.labelToShowName.text = self.myMountain;
}

希望对你有帮助

[编辑] 在 MountainInformation.h 中导入您的山类。

#import "MountainObject.h"

将属性更改为

@property(nonatomic, strong) MountainObject *selectedMountain

现在在之前的 View Controller 中。

 if([segue.identifier isEqualToString:@"pushToMountainInfo"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
UINavigationController *nav = segue.destinationViewController;

MountainObject *mountain = [self.mountain objectAtIndex.indexPath.row];
destViewController.selectedMountain = mountain;
}

在 MountainInformation.h

-viewDidLoad{
NSString *mountainName = self.selectedMountain.name;
NSString *mountainRegion =self.selectedMountain.region;
NSString *mountainHeight =self.selectedMountain.height;
//and other properties. and then you can set it to a single label by using
self.myLabel.text = [NSString stringWithFormat:@" Name - %@, Height- %@, Region- %@",mountainName, mountainHeight, mountainRegion];
}