我正在开发一个应用程序,它通过JSON从Web服务器获取数据到UITableViewController
。
加载数据需要时间,因此我希望在viewDidLoad
的加载时间内显示微调器。
这是我的第一个申请,所以我需要更多介绍一下如何做到这一点。
viewDidLoad
方法- (void)viewDidLoad
{
[super viewDidLoad];
NSString *categoryId = catId;
NSString *post =[NSString stringWithFormat:@"categoryId=%@",categoryId];
NSString *cat = [NSString stringWithFormat:@"&cityId=%@",cityId];
NSString *hostStr = @"http://localhost:8888/iphone-so/bycategory.json.php?";
hostStr = [hostStr stringByAppendingString:post];
hostStr = [hostStr stringByAppendingString:cat];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:hostStr]];
NSError *error;
productsRaw = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
products = [productsRaw objectForKey:@"products"];
productKeys = [products allKeys];
}
答案 0 :(得分:0)
您可以使用MBProgressHUD只需将MBProgressHUD.h和MBProgressHUD.m文件添加到您的项目中(如果您启用了ARC,则可能需要转换为ARC)
// Add right after your [super viewDidLoad]; ] your start connection method or in viewdidload whatever....
- (void)viewDidLoad
{
[super viewDidLoad];
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = @"Loading...";
// rest of the code goes here
}
// Add at start of requestFinished AND requestFailed
[MBProgressHUD hideHUDForView:self.view animated:YES];
答案 1 :(得分:0)
- (void)viewDidLoad
{
[super viewDidLoad];
// create the activity indicator
UIActivityIndicator *indicator = [UIActivityIndicator alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGrey];
// add it
[self.view addSubview:indicator];
// animate it
[indicator startAnimating];
// your code
NSString *categoryId = catId;
NSString *post =[NSString stringWithFormat:@"categoryId=%@",categoryId];
NSString *cat = [NSString stringWithFormat:@"&cityId=%@",cityId];
NSString *hostStr = @"http://localhost:8888/iphone-so/bycategory.json.php?";
hostStr = [hostStr stringByAppendingString:post];
hostStr = [hostStr stringByAppendingString:cat];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:hostStr]];
NSError *error;
productsRaw = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
products = [productsRaw objectForKey:@"products"];
productKeys = [products allKeys];
// stop animating the indicator
[indicator stopAnimating];
}