當點擊表格視圖單元格時緩慢加載

Question

當我點擊表格視圖單元格時，它將在同一個表格視圖中持續一段時間（直到下一頁完全加載），那麼它將顯示下一個視圖..

我要上單擊表格視圖單元格，應立即後藤下一個頁面，並顯示加載頁面彈出..

我有impActivityAgent嘗試，並試圖表明警報視圖時，它會進入下一個頁面（但查看是前一頁即表格視圖）..但..其完全加載頁面，這將需要時間，然後其顯示警報..

在下一頁我發佈和解析數據，這將需要時間，在那段時間我想顯示活動指標..

我已經嘗試了很多方法，但仍然第一次完全加載下一頁，然後顯示內容或alertView或活動的指標，我不能夠在表格視圖單元格單擊時，顯示活動的指標..

我的代碼：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    nextTableViewController *doc = [[nextTableViewController alloc]initWithNibName:@"nextTableViewController" bundle:nil]; 
    [self.navigationController pushViewController:doc animated:YES]; 
} 

或下一視圖控制器是：

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 
// Do any additional setup after loading the view from its nib. 
[[ImpActivityAgent defaultAgent] makeBusy:YES]; 

NSURL *loadUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/gmail.com",inputURL]]; 
htmlData = [NSData dataWithContentsOfURL:loadUrl]; 
self.htmlSTR = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding]; 
[self parseHTML]; 
} 

和在解析函數我解析我得到的內容，作爲HTML格式的答覆使用「hpple」解析器..

Answer 1

只需使用一個單獨的線程來處理解析。希望這段代碼能幫助你。

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 
// Do any additional setup after loading the view from its nib. 
[[ImpActivityAgent defaultAgent] makeBusy:YES]; 

[NSThread detachNewThreadSelector:@selector(newMethodForParsing) toTarget:self withObject:nil]; 

} 


-(void)newMethodForParsing 
{ 
NSURL *loadUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/gmail.com",inputURL]]; 
htmlData = [NSData dataWithContentsOfURL:loadUrl]; 
self.htmlSTR = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding]; 
[self parseHTML]; 

[tableView reload]; // tableView refers to ur table view name 

} 

Answer 2

試試這個

-(void)viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 
    [[ImpActivityAgent defaultAgent] makeBusy:YES]; 
    [self performSelectorInBackground:@selector(start) withObject:Nil]; 
    //or you can use after delay then no need to use perform selector on main thread in start method. 
    [self performSelector:@selector(start) withObject:nil afterDelay:0.5]; 
} 

-(void)start 
{ 
    NSURL *loadUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/gmail.com",inputURL]]; 
    htmlData = [NSData dataWithContentsOfURL:loadUrl]; 
    self.htmlSTR = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding]; 
    [self performSelectorOnMainThread:@selector(parseHTML) withObject:Nil waitUntilDone:YES]; 
} 

Answer 3

試試吧....

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(newMethodForParsing) userInfo:nil repeats:NO]; 
} 

-(void)newMethodForParsing 
{ 
NSURL *loadUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/gmail.com",inputURL]]; 
htmlData = [NSData dataWithContentsOfURL:loadUrl]; 
self.htmlSTR = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding]; 
[self parseHTML]; 
} 

Answer 4

Ganapathy的回答是存在內存泄漏，你需要放置一個autoreleasepool的方法內。這是一個更簡單的方法來做到這一點。這將在主線程上運行，但在隊列中的現有任務之後運行。

如果你想讓它在不同的線程運行與dispatch_get_global_queue()

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 
    [[ImpActivityAgent defaultAgent] makeBusy:YES]; 

    dispatch_async(dispatch_get_main_queue(), ^{ 

     NSURL *loadUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/gmail.com",inputURL]]; 
     htmlData = [NSData dataWithContentsOfURL:loadUrl]; 
     self.htmlSTR = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding]; 
     [self parseHTML]; 
    ) 
}