當我在模擬器上運行iphone應用程序，屏幕是白色的

Question

我不知道什麼是錯誤的應用程序它工作正常，直到我試圖改變東西與textlabel textview然後墜毀。所以我試着將它改回原來的狀態，它仍然崩潰。有任何想法嗎？

#import "TestViewController.h" 

@implementation TestViewController 

@synthesize labelsText; 


-(void)setup { 
    titles = [NSArray arrayWithObjects:@"Title 1",@"Title 2",@"Title 3",@"Title 4", nil]; 
} 



-(IBAction) nextclicked:(id)sender{ 
    titles = [NSArray arrayWithObjects:@"iology is the scientific study of life. Bam",@"This works? Wow",@"Still Works.",@"garret is the coolest awesome person awesome wowowowwwwwwwwwwwwwwwwwwwwwwwwwww", nil]; 
     if (step<titles.count-1) { 
     step++; 
    } 
    else 
    { 
     step= 0; 
    } 
    labelsText.text = [titles objectAtIndex:step]; 
    } 



-(IBAction) prevClicked:(id)sender{ 
    titles = [NSArray arrayWithObjects:@"Biology is the scientific study of life. Bam",@"This works? Wow",@"Still Works.",@"garret is the coolest awesome person awesome wowowowwwwwwwwwwwwwwwwwwwwwwwwwww", nil]; 
    if (step>0) { 
     step--; 
    } 
    else 
    { 
     step =titles.count-1; 
    } 
    labelsText.text = [titles objectAtIndex:step]; 
    } 



- (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; 
     self.labelsText=nil; 
} 


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

@end 

.h文件中：

#import <UIKit/UIKit.h> 

@interface TestViewController : UIViewController { 
     UILabel *labelsText; 
    UIButton *btn; 
    int step; 
    NSArray *titles; 
       } 
@property (nonatomic, retain) UILabel *labelsText; 
-(IBAction) nextclicked:(id)sender; 
-(IBAction) prevClicked:(id)sender; 



    @end 

Answer 1

我想你錯過了這一點：

在你的榜樣應該是labelstext和按鈕了。