我有一个UIAlertView,询问用户是否要复制一堆联系人。在用户单击“继续”之后,我希望AlertView消失,由显示加载速率的UIProgressView替换。
除了在用户单击“继续”后警报保留在XIB上之外,一切都正常运行,并且在整个进程运行之前它不会消失。一旦它消失,UIProgressView栏就会出现,但到那时它已达到100%。
如何立即从屏幕上清除UIAlertView并显示进度条的增长。
这是代码。谢谢你的帮助。
-(IBAction)importAllAddressBook:(id)sender {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Import ALL Contacts" message:@"Do you want to import all your Address Book contacts? (Please note that only those with a first and last name will be transfered)" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Continue", nil];
[alert show];
[alert release];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (buttonIndex == 0) {
NSLog(@"NO STOP");
return;
}else {
NSLog(@"YES CONTINUE");
importAllContactsProgress.hidden = NO; // show progress bar at 0
[self importAllMethod];
}
}
// method to import all Address Book
-(void) importAllMethod {
importAllContactsProgress.progress = 0.0;
load names etc etc
答案 0 :(得分:2)
您想要在后台线程上执行导入:
[self performSelectorInBackground:@selector(importAllMethod)];
您的导入方法阻止主线程并阻止任何UI操作发生。