EXC_BAD_ACCESS的主要功能和無法通過類

Question

更新後通過實例變量

現在，我對主2次EXC_BAD_ACCESS出7，我不知道爲什麼heightOfPumpView結果從0所述pumpCustomView類時pumpViewHeight的結果爲607

PumpViewController.m

#import "PumpViewController.h" 
#import "PumpModel.h" 
#import "PumpCustomView.h" 

@implementation PumpViewController 

@synthesize labels; 
@synthesize heightOfPumpView; 
- (id)init 
{ 

if (self = [super init]) 
{ 
    labels = [[PumpModel alloc]init]; 

    PumpCustomView* pumpView = [PumpCustomView alloc]; 
    heightOfPumpView = [pumpView pumpViewHeight]; 
    [labels pumpCreateLabel:heightOfPumpView]; 
    labelsArray = [[NSMutableArray alloc]initWithArray:[labels labelsGroup]]; 

    [labels release]; 

     if (labelsArray!=nil) 
     { 
      [pumpView addSubview:[labelsArray objectAtIndex:2]]; 
     } 



    [labelsArray release]; 
    [pumpView release]; 
} 

return self; 
} 


-(void) dealloc 
{ 
[super dealloc]; 

} 

@end 

PumpModel.m

#import "PumpModel.h" 
#import "PumpViewController.h" 
#import "PumpCustomView.h" 

@implementation PumpModel 
@synthesize labelsGroup; 

-(id)init 
{ 
self = [super init]; 
return self; 
} 

-(void)pumpCreateLabel:(float)pumpViewHeight 
{ 
theNumberOfPump = 8; 
PumpViewController* pumpViewControllerAlloc = [PumpViewController alloc]; 
labelsGroup = [[NSMutableArray alloc]init]; 

for (int i = 0;i < theNumberOfPump; i++) 
{ 
    int pumpViewHeight = [pumpViewControllerAlloc heightOfPumpView]; 
    int pumpViewWidthA = 259; 

    int resultHeight = pumpViewHeight/theNumberOfPump; 
    CGFloat resultWidth = pumpViewWidthA/2; 
    positionChart[i] = resultHeight * i;   

    newLabel[i] = [[NSTextField alloc] init] ; 

    [newLabel[i] setIntValue:i]; 

    newLabel[i].frame = CGRectMake(resultWidth, positionChart[i], 300, 100); 
    newLabel[i].font= [NSFont fontWithName:@"Arial" size:12]; 
    newLabel[i].textColor= [NSColor blackColor]; 
    newLabel[i].backgroundColor= [NSColor whiteColor]; 

    [labelsGroup addObject:newLabel[i]]; 
    [newLabel[i] release]; 

    NSLog(@"%@ %d",[[labelsGroup objectAtIndex:i] stringValue],positionChart[i]); 
} 
[pumpViewControllerAlloc release]; 

} 

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

Answer 1

你不應該[super init]之前發送消息的對象，如：

- (id)init 
{ 
    if (self = [super init]) 
    { 
     [self setNumberOfPump:8]; 
    } 
    return self; 
} 

這也適用於：

-(id)initWithNumberOfPump:(int)numberOfPump 
{ 
    if (self = [super init]) { 
     theNumberOfPump = numberOfPump; 
     [self pumpCreateLabel]; 
    } 
    return self ; 
} 

Answer 2

如果你有一個碰撞，後的回溯崩潰。

看着你的setNumberOfPump:方法，這看起來很不對。

• 標籤分配，然後釋放，有可能留下的實例變量作爲懸掛引用，會崩潰後

• labelsArray泄漏

• 您dealloc不會釋放任何內存

您應該嘗試在代碼上運行Build and Analyze，修復任何錯誤。上述問題與有關init模式的意見相結合表明，您應該查看Objective-C文檔以更好地理解初始化和內存管理模式。