Iphone 在执行代码之前未加载ipad子视图

我有一个命令，它应该在执行特定的时间密集型代码之前加载子视图。无论命令如何运行，都会及时执行代码，然后子视图显示出来。我能做些什么来解决这个问题吗

progressViewController = [[ProgressView alloc] initWithNibName:@"ProgressView" bundle:[NSBundle mainBundle]];
[self.view addSubview:[progressViewController view]];



NSString *name=@"guy";
NSString *encodedName =[[NSString alloc] init];

int asci;

for(int i=0; i < [name length]; i++)
{
    //NSLog(@"1");
        asci = [name characterAtIndex:i];
    NSString *str = [NSString stringWithFormat:@"%d,", asci];
        encodedName =[encodedName stringByAppendingFormat: str];
}

NSString *urlString = [NSString stringWithFormat:@"someurl.com"];

NSURL *theUrl = [[NSURL alloc] initWithString:urlString];

NSString *result=[NSString stringWithContentsOfURL:theUrl];

result = [result substringFromIndex:61];
result = [result substringToIndex:[result length] - 20];

NSLog(result);


outLab.text=result;


[[progressViewController view] removeFromSuperview];

progressViewController=[[ProgressView alloc]initWithNibName:@“ProgressView”包：[NSBundle mainBundle]]；
[self.view addSubview:[progressViewController视图]]；
NSString*name=@“guy”；
NSString*encodedName=[[NSString alloc]init]；
int asci；
对于（int i=0；i<[名称长度]；i++）
{
//NSLog（@“1”）；
asci=[name characterAtIndex:i]；
NSString*str=[NSString stringWithFormat:@“%d”，asci]；
encodedName=[encodedName stringByAppendingFormat:str]；
}
NSString*urlString=[NSString stringWithFormat:@“someurl.com”]；
NSURL*theUrl=[[NSURL alloc]initWithString:urlString]；
NSString*result=[NSString stringWithContentsOfURL:theUrl]；
结果=[result substringFromIndex:61]；
结果=[结果子字符串到索引：[结果长度]-20]；
NSLog（结果）；
文本=结果；
[[progressViewController视图]从SuperView移除]；

1）试试看 [self.view setNeedsUpdating] 添加子视图后

(二) 尝试将时间密集型线程拆分为另一个线程

- (void) f
{
// executed in main UI thread
progressViewController = [[ProgressView alloc] initWithNibName:@"ProgressView" bundle:[NSBundle mainBundle]];
[self.view addSubview:[progressViewController view]];

  [NSThread detachNewThreadSelector:@selector(doCompute) toTarget:self
        withObject:nil];

}

- (void) doCompute
{
// in a different thread....so we need a autoreleasepool
    NSAutoreleasePool *autoreleasepool = [[NSAutoreleasePool alloc] init];
   // do your computation here...

[self performSelectorOnMainThread:@selector(taskComplete:)
                               withObject:result waitUntilDone:NO];

 [autoreleasepool release];

}

- (void) taskComplete
{
   // executed in UI thread
   [self.progressView removeFromSuperView];
}

---

您可以对视图进行子类化，然后使用viewDidLoad函数来执行长时间运行的代码