更新时间:2023-11-10 07:51:21
使用GCD:
UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(135,140,50,50)];
spinner.color = [UIColor blueColor];
[spinner startAnimating];
[_mapViewController.view addSubview:spinner];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// lots of code run in the background
dispatch_async(dispatch_get_main_queue(), ^{
// stop and remove the spinner on the main thread when done
[spinner removeFromSuperview];
});
});