我正在爲iOS的第一個Objective-C應用程序工作,並且在重新加載UITableView中的數據時遇到問題。iOS UITableView只滾動時重新加載單元格數據
重新加載數據後,單元格內容將只在單元格滾動到容器可視區域下方時更新。
這裏是我的.h代碼:
#import <UIKit/UIKit.h>
#import "AFHTTPClient.h"
#import "AFJSONRequestOperation.h"
@interface HelloWorldViewController : UIViewController <UITextFieldDelegate, UITableViewDelegate, UITableViewDataSource>{
NSMutableArray *tableViewArray;
IBOutlet UITableView *tableView;
}
@property (nonatomic, retain) NSMutableArray *tableViewArray;
@property (weak, nonatomic) IBOutlet UILabel *connectionLabel;
@property (nonatomic, retain) IBOutlet UITableView *tableView;
@property (weak, nonatomic) IBOutlet UITextView *textArea;
@property (weak, nonatomic) IBOutlet UITextField *textField2;
@property (weak, nonatomic) IBOutlet UILabel *label;
@property (weak, nonatomic) IBOutlet UITextField *textField;
@property (copy, nonatomic) NSString *userName;
@property (copy, nonatomic) NSString *passWord;
@property (copy, nonatomic) NSMutableString *serverResponse;
- (IBAction)callHome:(id)sender;
@end
和.M代碼:
#import "HelloWorldViewController.h"
@interface HelloWorldViewController()
@end
@implementation HelloWorldViewController
@synthesize tableViewArray;
@synthesize connectionLabel;
@synthesize userName = _userName;
@synthesize passWord = _password;
@synthesize serverResponse = _serverResponse;
@synthesize tableView;
@synthesize textArea;
@synthesize textField2;
@synthesize label;
@synthesize textField;
- (void)viewDidLoad
{
[super viewDidLoad];
tableViewArray = [[NSMutableArray alloc] init];
[tableViewArray addObject:@"TEST1"];
[tableViewArray addObject:@"TEST2"];
[tableViewArray addObject:@"TEST3"];
}
- (void)viewDidUnload
{
[self setTextField:nil];
[self setLabel:nil];
[self setTextField2:nil];
[self setTextArea:nil];
[self setTableView:nil];
[self setConnectionLabel:nil];
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
if (theTextField == self.textField) {
[theTextField resignFirstResponder];
}
return YES;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [tableViewArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.textLabel.text = [self.tableViewArray objectAtIndex: [indexPath row]];
return cell;
}
- (IBAction)callHome:(id)sender {
self.userName = self.textField.text;
self.passWord = self.textField2.text;
NSMutableString *tempResponse = [[NSMutableString alloc] initWithFormat:@""];
AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://example.com/"]];
[client setAuthorizationHeaderWithUsername:self.userName password:self.passWord];
[client getPath:@"login.do" parameters:nil
success:^(AFHTTPRequestOperation *operation , id responseObject){
NSLog(@"Authentication Success: %d", operation.response.statusCode);
self.serverResponse = [NSMutableString stringWithFormat:@"Authentication Success: %d", operation.response.statusCode ];
[tempResponse appendString: self.serverResponse];
self.textArea.text = tempResponse;
}
failure:^(AFHTTPRequestOperation *operation , NSError *error){
NSLog(@"Authentication Error: %@\n%@", error, operation);
}
];
[client getPath:@"test.json.do" parameters:nil
success:^(AFHTTPRequestOperation *operation , id responseObject){
NSLog(@"Retrieval Success: %d", operation.response.statusCode);
NSDictionary *results = [operation.responseString JSONValue];
NSMutableArray *buildings = [results objectForKey:@"buildings"];
NSMutableArray *names = [[NSMutableArray alloc] init];
for (NSDictionary *building in buildings)
{
[names addObject:[building objectForKey:@"name"]];
}
self.tableViewArray = names;
self.serverResponse = [NSMutableString stringWithFormat:@"\nBuilding List Retrieval Success: %d", operation.response.statusCode ];
[tempResponse appendString: self.serverResponse];
self.connectionLabel.text = tempResponse;
}
failure:^(AFHTTPRequestOperation *operation , NSError *error){
NSLog(@"Retrieval Error: %@\n%@", error, operation);
}
];
NSLog(@"tableView is: %@", [tableView description]);
[tableView reloadData];
}
@end
當我打電話[self.tableView description]
結果爲空,但如果我把它從cellForRowAtIndexPath
然後我得到的以下結果:
tableView is: <UITableView: 0x8a71000; frame = (0 0; 280 191); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x6b7e860>; contentOffset: {0, 0}>. Delegate: HelloWorldViewController, DataSource: HelloWorldViewController
下面是界面生成器的屏幕截圖:
所有幫助表示讚賞!謝謝!
我添加了界面構建器的屏幕截圖。我ctrl從突出顯示的表視圖拖動到Hello World View控制器。再次感謝... – kevinstueber 2012-03-24 02:09:06