Iphone 未填充UIWebView CGRectMake的YouTube自定义设置参数

我在UIWebView的自定义设置参数方面遇到问题，我尝试了100种不同的方法。。但它一直在顶部我的导航栏下，它也在滚动条的底部移动了一英寸左右。我试图使用CGRectMake，但它没有填充任何内容

 @interface songVideoViewController ()

 @end

 @implementation songVideoViewController

 @synthesize tubeName;
 @synthesize webVPrg;

 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 {
 self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 if (self) {
 // Custom initialization
 }
 return self;
 }

  - (void)viewDidLoad
  {
 //webVPrg = [[UIWebView alloc]init];
 [super viewDidLoad];
 _sidebarButton.target = self.revealViewController;
 _sidebarButton.action = @selector(revealToggle:);
 _sidebarButton.tintColor = [UIColor colorWithWhite:0.96f alpha:0.2f];
// Set the Label text with the selected recipe

 NSArray *bossConverter = [tubeName componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

NSString *bossInput = [bossConverter componentsJoinedByString:@"+"];

webVPrg = [[UIWebView alloc] initWithFrame:self.view.frame];

NSURL *url = [NSURL URLWithString:([NSString stringWithFormat:@"http://www.youtube.com/results?search_query=%@&oq=%@&v2", bossInput, bossInput])];

NSURLRequest *request = [NSURLRequest requestWithURL:url];

//webVPrg.frame = CGRectMake(0, 0, 100, 50);
webVPrg.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:webVPrg];
[webVPrg loadRequest:request];


}