我正在制作我的第一个应用程序，并且正在使用带有 Storyboard 的 XCode 4。多亏了这个地方、大量的教程、Apple 的档案数据库和一些我，我正在慢慢地掌握基础知识。这是一个从 plist 填充的应用程序。plist 是一个带有字典的数组，字典中包含有关挪威不同红酒的信息。首先，plist 填充了一个 TableView。我正在使用 NSSortDescritor 对 TableView 进行排序，并在导航栏中添加了一个按钮，以便在我希望它由另一个值显示时使用。它看起来像这样：
RootTableViewController.h：
#import <UIKit/UIKit.h>
@interface RootTableViewController : UITableViewController <UIActionSheetDelegate> {
NSMutableArray *sortedObjects;
}
-(IBAction)sortButtonPressed:(id)sender;
@end
RootTableViewController.m：
#import "RootTableViewController.h"
#import "ObjectCell.h"
#import "DetailViewController.h"
@interface RootTableViewController ()
@end
@implementation RootTableViewController
- (IBAction)sortButtonPressed:(id)sender;
{
UIActionSheet *sort = [[UIActionSheet alloc]
//InitWithStyle etc for sheet
}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSSortDescriptor *sortDesc;
if (buttonIndex == 0) {
sortDesc = [[NSSortDescriptor alloc] initWithKey:@"Name" ascending:YES];
[sortedWines sortUsingDescriptors:[NSArray arrayWithObject:sortDesc]];
}
if (buttonIndex == 1) {
sortDesc = [[NSSortDescriptor alloc] initWithKey:@"Country" ascending:YES];
[sortedWines sortUsingDescriptors:[NSArray arrayWithObject:sortDesc]];
}
[self.tableView reloadData];
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *myfile = [[NSBundle mainBundle]
pathForResource:@"Objects" ofType:@"plist"];
sortedObjects = [[NSMutableArray alloc]initWithContentsOfFile:myfile];
NSSortDescriptor * sortDesc = [[NSSortDescriptor alloc] initWithKey:@"Popularity" ascending:YES];
[sortedObjects sortUsingDescriptors:[NSArray arrayWithObject:sortDesc]];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (void)viewWillAppear:(BOOL)animated {
[self.tableView deselectRowAtIndexPath:[self.tableView indexPathForSelectedRow] animated:YES];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [sortedObjects count];
}
//(I’m using a Custom Cell for the TableView)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"objectCell";
ObjectCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[ObjectCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.nameLabel.text = [[sortedObjects objectAtIndex:indexPath.row] valueForKey:@"Name"];
cell.countryLabel.text = [[sortedObjects objectAtIndex:indexPath.row] valueForKey:@"Country"];
return cell;
}
#pragma mark - Table view delegate
//Then the selected object is sent to the DetailViewController in this segue:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:@"DetailSegue"]) {
NSIndexPath *selectedRowIndex = [self.tableView indexPathForSelectedRow];
DetailViewController *detailViewController = [segue destinationViewController];
detailViewController.selectedObject = [sortedObjects objectAtIndex:selectedRowIndex.row];
}
}
@end
然后 DetailViewController 接收所选对象以使用其中的数据填充 Labels 和 ImageViews。
DetailViewController.h：
#import <UIKit/UIKit.h>
@interface DetailViewController : UIViewController
@property (nonatomic, strong) IBOutlet UILabel *districtLabel;
@property (nonatomic, strong) IBOutlet UILabel *countryLabel;
@property (nonatomic, strong) IBOutlet UIImageView *bottleImageView;
@property (nonatomic, strong) NSString *selectedObject;
@end
DetailViewController.m：
#import "WinesDetailViewController.h"
@interface WinesDetailViewController ()
@end
@implementation WinesDetailViewController
@synthesize districtLabel,countryLabel,bottleImageView;
@synthesize selectedObject;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidAppear:(BOOL)animated
{
self.title = [selectedObject valueForKey:@"Name"];
[super viewDidAppear:animated];
}
- (void)viewDidLoad
{
[super viewDidLoad];
districtLabel.text = [selectedObject valueForKey:@"District"];
countryLabel.text = [selectedObject valueForKey:@"Country"];
bottleImageView.image = [UIImage imageNamed:[selectedObject valueForKey:@"Image"]];
self.navigationController.navigationBar.translucent = YES;
self.wantsFullScreenLayout = YES;
//Then I’ve added recognizers for left and right swiping:
UISwipeGestureRecognizer *leftGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeDetectedLeft:)];
leftGesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:leftGesture];
UISwipeGestureRecognizer *rightGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeDetectedRight:)];
rightGesture.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:rightGesture];
}
//And the voids to handle the swipes:
- (void)swipeDetectedRight:(UISwipeGestureRecognizer *)sender
{
//Access previous cell in TableView
}
- (void)swipeDetectedLeft:(UISwipeGestureRecognizer *)sender
{
//Access next cell in TableView
}
//Some more besic code for the view..
@end
如您所见，我在 DetailViewController 中添加了 UISwipeGestureRecognizers，因为我想在向右滑动时使用上一个单元格的数据重新加载它，并在向左滑动时重新加载下一个单元格。现在我不知道如何处理检测到的滑动空白，如何从 DetailView 到达 selectedRowIndex 并滑动单元格？我是编程新手，很长时间以来一直在尝试解决这个问题，所以代码示例会很棒，所以如果你知道我的意思，答案不会导致 100 个新问题。如果你能帮助我，非常感谢。