开始吧，在这个原型中，一切都按照你想要的方式工作.

Here you go, in this prototype things work exactly how you want them to.

标题:

#import <UIKit/UIKit.h>

@interface AlertViewProtoViewController : UIViewController
{

}

- (void) showAlertViewWithTitle:(NSString *)title;
- (void) checkForUpdatesInContext;
- (void) update;
- (void)someMethod;
- (void)someOtherMethod;

@end

#import "AlertViewProtoViewController.h"

类:

@implementation AlertViewProtoViewController

UIAlertView *alertView;
bool updateDone;
UILabel *test;
bool timershizzle;

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColor yellowColor];

    UILabel *test = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 500, 500)];
    test.backgroundColor = [UIColor blueColor];
    [self.view addSubview:test];

    [self performSelector:@selector(checkForUpdatesInContext) withObject:nil afterDelay:0.0];
}


- (void)update
{
    //NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; //commented for auto ref counting
    NSLog(@"update start");
    //your update stuff
    NSLog(@"update end");
    updateDone = YES;
    //[pool release];
}

- (void)checkForUpdatesInContext//:(NSManagedObjectContext *)myManagedObjectContext
{
    //[self loadUpdateTime];

    NSLog(@"Update start");

    NSDate *now = [NSDate dateWithTimeIntervalSinceNow:[[NSTimeZone localTimeZone] secondsFromGMT]];
    //    if ([now timeIntervalSinceDate:updateTime] < UPDATE_TIME_INTERVAL)
    //    {
    //        return;
    //    }
    [self showAlertViewWithTitle:@"Update"];
    //[self setManagedObjectContext:myManagedObjectContext];

    [self performSelector:@selector(someMethod) withObject:nil afterDelay:0.0];

    [self performSelector:@selector(someOtherMethod) withObject:nil afterDelay:0.0];
}

-(void)someOtherMethod
{
    while (!updateDone) {
        //        NSLog(@"waiting...");
    }

    [alertView dismissWithClickedButtonIndex:0 animated:YES];
    NSLog (@"Update done");
    self.view.backgroundColor = [UIColor greenColor];
}

-(void)someMethod
{
    [self performSelectorInBackground:@selector(update) withObject:nil];
}

- (void) showAlertViewWithTitle:(NSString *)title
{
    alertView = [[UIAlertView alloc] initWithTitle:title message:@"Daten werden aktualisiert..." delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
    alertView.frame = CGRectMake(100, 100, 200, 200);
    alertView.backgroundColor = [UIColor whiteColor];

    [self.view addSubview:alertView];

    [self.view setNeedsDisplay];

    NSLog (@"AlertView shows");
}

@end

您应该根据自己的目的进行调整，但它确实有效.

You should adjust were needed for your own purposes but it works.