我有 2 个 TableViewController。当用户点击 UIBarButtonItem 时,它会在 SaveViewController 中保存 UITextField、runnameField 中的文本。它应该获取 runnameField 的文本并将其放入一个数组中,runsArray。在RecordVC 中,tableView 的数据应该来自runsArray。
有人可以帮我解决这个问题吗?我已经在谷歌上搜索了很长时间,找不到任何答案。
保存 View Controller .h:
#import <UIKit/UIKit.h>
#import "RecordsViewController.h" //Next ViewController
@interface SaveViewController : UITableViewController <UITableViewDataSource,UITableViewDelegate> {
__weak IBOutlet UITextField *runnameField;
RecordsViewController *RecordsVCData;
}
@property (weak, nonatomic) IBOutlet UITextField *runnameField;
@property (weak, nonatomic) IBOutlet UITextView *runnotesTextView;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *saveBarItem;
@property (nonatomic, retain) RecordsViewController *RecordsVCData;
- (IBAction)saverun:(UIBarButtonItem *)sender;
- (IBAction)goAwayKeyboard:(id)sender;
@end
保存 View Controller .m:
- (IBAction)saverun:(UIBarButtonItem *)sender {
RecordsViewController *RecordsVC = [[RecordsViewController alloc] initWithNibName:nil bundle:nil];
RecordsVC.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
self.RecordsVCData = RecordsVC;
[RecordsVC.runsArray addObject:[NSString stringWithFormat:@"%@", runnameField.text]];
[self presentModalViewController:RecordsVC animated:YES];
}
- (IBAction)goAwayKeyboard:(id)sender {
[sender resignFirstResponder];
}
记录 View Controller .h:
#import <UIKit/UIKit.h>
@interface RecordsViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate> {
NSMutableArray *runsArray;
}
@property (weak, nonatomic) NSString *runname;
@property (strong, nonatomic) NSString *runnotes;
@property (weak, nonatomic) UITableViewCell *cell;
@property (retain,nonatomic) NSMutableArray *runsArray;
@end
RecordsViewController.m:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath {
// Identifier for retrieving reusable cells.
static NSString *cellIdentifier = @"MyCellIdentifier";
// Attempt to request the reusable cell.
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
// No cell available - create one
if(cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:cellIdentifier];
[cell.textLabel setText:[NSString stringWithFormat:@"%@",[runsArray objectAtIndex:indexPath.row]]];
}
// Set the text of the cell to the runnamestring.
[cell.textLabel setText:[NSString stringWithFormat:@"%@",[runsArray objectAtIndex:indexPath.row]]];
return cell;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [runsArray count];
}
任何帮助都非常感谢。
谢谢,
德鲁夫
最佳答案
在您更新 RecordsVC.runsArray 时,我想您的 tableview 已经被初始化和加载,尽管没有数据。
我最近在这种情况下所做的就是使用通知。
在 RecordsViewController 中,您将在 init 方法中注册通知:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dataLoaded:) name:@"runsArrayLoaded" object:nil];
// Custom initialization
}
return self;
}
同样在 RecordsViewController 中,您将需要在收到通知时调用的方法。在这种情况下,它是 dataLoaded:
-(void) dataLoaded:(NSNotification *)notif {
if (notif.userInfo){
runsArray = [notif.userInfo objectForKey:@"newdata"];
[self.tableview reloadData];
}
}
使所有这些魔法起作用的部分是在 SaveViewController 类中的 saverun 方法中。
- (IBAction)saverun:(UIBarButtonItem *)sender {
RecordsViewController *RecordsVC = [[RecordsViewController alloc] initWithNibName:nil bundle:nil];
RecordsVC.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
[runsArray addObject:[NSString stringWithFormat:@"%@", runnameField.text]];
[self presentModalViewController:RecordsVC animated:YES];
// notify the RecordsViewController that new data is available
NSMutableDictionary* userInfo = [[NSMutableDictionary alloc] initWithCapacity:1];
[userInfo setObject:runsArray forKey:@"newdata"];
[[NSNotificationCenter defaultCenter] postNotificationName:@runsArrayLoaded" object:nil userInfo:(NSDictionary*)userInfo];
}
最后,您必须清理并删除 RecordsViewController 类中的通知观察。在您的 viewWillDisappear 中,添加以下行:
[[NSNotifcation defaultCenter] removeObserver:self name:@"runsArrayLoaded" object:nil];
关于nsmutablearray - 从前一个 View Controller 中的数组中获取数据,将其放入另一个 TableViewController,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13333952/