模拟器中出现黑屏问题

//
//  FunctionMachineViewController.h
//  FunctionMachine
//
//  Created by Kameron Schadt on 5/24/11.
//  Copyright 2011 Willamette University. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface FunctionMachineViewController : UIViewController {

IBOutlet UITextField* equation;
IBOutlet UISlider* startLevel;
IBOutlet UITextView* startLevelNumber;

}

- (IBAction) startOnePlayer:(id)sender;
- (IBAction) startTwoPlayer:(id)sender startingEquation:(NSString*)equationUsed;
- (IBAction) sliderValueChanged:(UISlider*)sender;

@property(nonatomic, retain) IBOutlet UISlider* startLevel;
@property(nonatomic, retain) IBOutlet UITextField* equation;
@property(nonatomic, retain) IBOutlet UITextView* startLevelNumber;

@end


//
//  FunctionMachineViewController.m
//  FunctionMachine
//
//  Created by Kameron Schadt on 5/24/11.
//  Copyright 2011 Willamette University. All rights reserved.
//

#import \"FunctionMachineViewController.h\"
#import \"GameViewController.h\"

@implementation FunctionMachineViewController

@synthesize equation, startLevel, startLevelNumber;

- (IBAction)sliderValueChanged:(UISlider*)sender {
[startLevelNumber setText:[NSString stringWithFormat:@\" %.1f\", [sender value]]];
}

-(IBAction)startOnePlayer:(id)sender
{
GameViewController* GameView = [[GameViewController alloc] initWithNibName:nil bundle:nil];
[GameView isOnePlayer:YES];
[self presentModalViewController:GameView animated:YES];
}

-(IBAction)startTwoPlayer:(id)sender startingEquation:(NSString*)equationUsed
{
GameViewController* GameView = [[GameViewController alloc] initWithNibName:nil bundle:nil];
[GameView isOnePlayer:NO];
[self presentModalViewController:GameView animated:YES];
}

- (void)viewDidLoad {
[super viewDidLoad];
}


// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:    (UIInterfaceOrientation)interfaceOrientation {
return YES;
}

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn\'t have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren\'t in use.
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}


- (void)dealloc {
[super dealloc];
}

@end