我正在尝试将数据加载到详细视图中。谁能看一看,为什么不显示呢?它可以很好地加载到我的rootviewcontroller中,而不是细节视图中。
DetailViewController.m
#import "DetailViewController.h"
@implementation DetailViewController
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
// Release anything that's not essential, such as cached data
}
- (void)setIcon:(UIImage *)newIcon
{
[super setIcon:newIcon];
iconView.image = newIcon;
}
- (void)setPublisher:(NSString *)newPublisher
{
[super setPublisher:newPublisher];
publisherLabel.text = newPublisher;
}
- (void)setName:(NSString *)newName
{
[super setName:newName];
nameLabel.text = newName;
}
- (void)dealloc
{
[iconView release];
[publisherLabel release];
[nameLabel release];
[priceLabel release];
[super dealloc];
}
@end
detailviewcontroller.h
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@interface DetailViewController : UIViewController {
IBOutlet UIImageView *iconView;
IBOutlet UILabel *publisherLabel;
IBOutlet UILabel *nameLabel;
IBOutlet UILabel *priceLabel;
}
@end
RootViewControllerPoints.m
#import "RootViewControllerPoints.h"
#import "DetailViewController.h"
#define USE_INDIVIDUAL_SUBVIEWS_CELL 1
#define DARK_BACKGROUND [UIColor colorWithRed:151.0/255.0 green:152.0/255.0 blue:155.0/255.0 alpha:1.0]
#define LIGHT_BACKGROUND [UIColor colorWithRed:172.0/255.0 green:173.0/255.0 blue:175.0/255.0 alpha:1.0]
@implementation RootViewController
@synthesize tmpCell, data;
#pragma mark View controller methods
- (void)viewDidLoad
{
[super viewDidLoad];
// Configure the table view.
self.tableView.rowHeight = 73.0;
self.tableView.backgroundColor = DARK_BACKGROUND;
self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
// Load the data.
NSString *dataPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"];
self.data = [NSArray arrayWithContentsOfFile:dataPath];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
switch (toInterfaceOrientation) {
case UIInterfaceOrientationPortrait:
case UIInterfaceOrientationLandscapeLeft:
case UIInterfaceOrientationLandscapeRight:
return YES;
default:
return NO;
}
}
#pragma mark Table view methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [data count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"ApplicationCell";
ApplicationCell *cell = (ApplicationCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
#if USE_INDIVIDUAL_SUBVIEWS_CELL
[[NSBundle mainBundle] loadNibNamed:@"IndividualSubviewsBasedApplicationCell" owner:self options:nil];
cell = tmpCell;
self.tmpCell = nil;
#endif
}
// Display dark and light background in alternate rows -- see tableView:willDisplayCell:forRowAtIndexPath:.
cell.useDarkBackground = (indexPath.row % 2 == 0);
// Configure the data for the cell.
NSDictionary *dataItem = [data objectAtIndex:indexPath.row];
cell.icon = [UIImage imageNamed:[dataItem objectForKey:@"Icon"]];
cell.publisher = [dataItem objectForKey:@"Publisher"];
cell.name = [dataItem objectForKey:@"Name"];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
detailViewController. = [data objectAtIndex:indexPath.row];
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
}
@end
这已经困扰了我好一阵子了,我看了无数示例,教程,甚至问过其他iphone开发人员。一切消息似乎都说了些不同。
最佳答案
第一个问题是,DetailViewController中的setXXX方法尝试调用超级setXXX,但是由于DetailViewController是UIViewController的子类,因此对这些super的调用将失败,因为UIViewController没有此类方法。在setXXX方法中删除对super的调用。
第二个问题是setXXX方法直接在DetailViewController上设置控件,但是在加载视图之前将无法访问这些控件,因此,如果在pushViewController调用之前调用这些方法,该控件将无法工作。
如果您按以下方式更改didSelectRowAtIndexPath中的代码,则它应该可以工作:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController setName:@"name here"];
[detailViewController setPublisher:@"publisher here"];
[detailViewController setIcon:yourImageVariableHere];
[detailViewController release];
}
尽管上面的更改应该起作用,但是您可能要考虑创建ivars来保存DetailViewController中的值(而不是使用ui控件本身来保存数据)。然后使用@property和@synthesize为它们创建属性。可以在创建DetailViewController之后立即设置属性,并且可以在视图的viewDidLoad中将ui控件设置为属性值。这将使DetailViewController可以更好地控制其ui的更新方式,允许您更改ui而不影响调用者,并且无需显示它即可设置其属性。
关于ios - 数据未在详细 View 中加载,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/2348813/