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我有一個很長的- (void)viewDidLoad { }函數，它使用互聯網來加載頁面，並且每當應用程序加載URL時，屏幕都是黑屏。我有一個UIActivityIndicator安裝程序來顯示地址正在加載，但我不知道如何防止它看起來好像應用程序沒有響應，並且我不想顯示網絡活動指示器[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];，因爲屏幕會仍然是黑色的，只在頂角有一個裝載機。我的代碼如下：iPhone SDK - （void）viewDidLoad {} - 顯示進度
- (void)viewDidLoad {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
email.text = [defaults objectForKey:@"mom_email"];
pass.text = [defaults objectForKey:@"mom_pass"];
if (email.text != nil && pass.text != nil) {
[self login:loginBtn];
}
}
- (IBAction)login:(id)sender {
[email resignFirstResponder];
[pass resignFirstResponder];
[loader startAnimating]; // Does nothing though
NSString *em = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)email.text,NULL,(CFStringRef)@"!*'();:@&=+$,/?%#[]",kCFStringEncodingUTF8);
NSString *ps = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)pass.text,NULL,(CFStringRef)@"!*'();:@&=+$,/?%#[]",kCFStringEncodingUTF8);
NSURL *url = [[NSURL alloc] initWithScheme:@"http" host:@"localhost" path:[[NSString alloc] initWithFormat:@"/app/login.php?email=%@&pass=%@", em, ps]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *loginResult = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
[loader stopAnimating];
NSRange range = [loginResult rangeOfString:@"1"];
if (range.location != NSNotFound) {
[self dismissModalViewControllerAnimated:YES]; // Doesn't do anything if function called from viewDidLoad
}
}