iphone - 我的自定义类在 UIViewController 内部损坏，无法跟踪它，没有编译器错误

Question

没有编译器错误，但无法跟踪我的类的实例方法。我很确定我只是没有正确设置它，但我想这可能是一些晦涩的配置(希望不是)。

无法跟踪我对类的调用(仅显示汇编程序)，并且 ATLCalCellList 类中的断点(即在 init、load、clear 处)永远不会执行。

UIViewController header :

//  ATLCalendarViewController.h
#import <UIKit/UIKit.h>
#import "ATLCalCellList.h"

@interface ATLCalendarViewController : UIViewController {
ATLCalCellList* calCellList ;
}
@property (nonatomic, strong) ATLCalCellList* calCellList ;

- (IBAction)btnTestLoadListPress:(id)sender;
- (void) refreshCalCellList ;
@end

主文件:

//  ATLCalendarViewController.m

#import "ATLCalendarViewController.h"
@implementation ATLCalendarViewController
@synthesize calCellList ;

- (void)viewDidLoad  {
  [super viewDidLoad];
  // Custom initialization   
  [self.calCellList init] ;
}

- (IBAction)btnTestLoadListPress:(id)sender 
{
  [self refreshCalCellList] ;
}

- (void) refreshCalCellList 
{
**//==================================  PROBLEM ========================================**
// BREAKPOINTS ON THE 4 LINES BELOW GET CALLED, BUT CAN'T TRACE INTO THE METHOD CODE
// TRACE INTO ON ANY OF THESE SHOWS ASSEMBLER
// IT LOOKS LIKE THE CALLED CODE IN THE METHODS IS NOT BEING EXECUTED
  [self.calCellList clear] ;
  self.calCellList.calListCount = 0 ;
  self.calCellList.calListDate = [NSDate date] ;  
  [self.calCellList load] ;   
}

@end

calCellList 的类头文件是:

//  ATLCalCellList.h
#import <Foundation/Foundation.h>
#import "ATLCalCellData.h"

@interface ATLCalCellList : NSObject {

  NSMutableArray *calListArray ;
  NSInteger       calListCount ;
  NSDate         *calListDate ;
  BOOL            calListSimulate ;
}

// PROPERTIES
@ property(nonatomic, strong) NSMutableArray *calListArray ;
@ property(nonatomic)         NSInteger       calListCount ;
@ property(nonatomic, strong) NSDate         *calListDate ;
@ property(nonatomic)         BOOL            calListSimulate ;

// METHODS    
- (id)  init ;
- (BOOL) load ;
- (BOOL) save ;
- (void) clear ;
- (void) addCell:    (ATLCalCellData *) calCellData ;
- (void) removeCell: (ATLCalCellData *) calCellData ;

如果您需要查看完整的类实现，这里是其中的大部分内容:

//  ATLCalCellList.m
#import "ATLCalCellList.h"
@implementation ATLCalCellList

@synthesize calListArray ;
@synthesize calListCount ;
@synthesize calListDate ;
@synthesize calListSimulate ;

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

  self.calListArray = nil ;
  self.calListArray = [calListArray init] ;
  self.calListDate  = [NSDate date] ;

  return self ;
}

- (BOOL) load
{
 // load data for one day
  ATLCalCellData* newCell ;
  if ([newCell init]) {
    newCell.calCellDate = self.calListDate ;
    newCell.calCellHour = x ;
    newCell.calCellMinute = 0 ;
    newCell.calCellTitle = @"Appt with Destiny" ;
    newCell.calCellLocation = @"Atlas World HQ" ;
    [newCell.calCellAlliesIDList addObject: @"333000333" ] ;
    [newCell.calCellAlliesNameList addObject: @"Joe Chicago"] ;  
    newCell.calCellDurationMinutes = 60 ;
    newCell.calCellAlarm1AdvanceMinutes = 30 ;        
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
    [offsetComponents setHour:0];
    [offsetComponents setMinute: newCell.calCellAlarm1AdvanceMinutes];
    newCell.calCellAlarm1Datetime = 
        [gregorian dateByAddingComponents:offsetComponents toDate:   
        newCell.calCellAlarm1Datetime options:0];            
          }
        }
      }
    }
  } else {
    // load the cells from the actual database:
    // #OPENTASK

    // end
  }
  return TRUE ;
}

- (BOOL) save
{
  // save data for one day
  return TRUE ;
}


- (void) clear {
  //  Clear the daylist array

  self.calListArray = nil ;
  [self.calListArray init];
}

- (void) addCell: (ATLCalCellData *) calendarCell {
  [self.calListArray addObject: calendarCell];
}

- (void) removeCell: (ATLCalCellData *) calendarCell {
  //  Find and remove the passed in cell from the array:
  // #TBD Locate the cell with the datetime and userid, then delete it
  // 
}

@end

Answer 1

我认为问题在于您正在对尚未实际分配的内容调用 init 。本质上，您的代码是告诉应用程序转到 self.calCellList 恰好指向的内存中的任何随机位置，将其视为对象，并向其发送一条 init 消息它。当然，这可能会导致各种问题。

如果您这样做，效果可能会更好:

- (void)viewDidLoad  {
  [super viewDidLoad];

  // Custom initialization   
  calCellList =  [[ATLCalCellList alloc] init] ;
}

另请注意，如果您这样做:

@property (nonatomic, strong) ATLCalCellList* calCellList ;
//...
@synthesize calCellList ;

...那么您不需要为该字段声明一个支持 ivar。具体来说，这是多余的:

ATLCalCellList* calCellList ;

当您@synthesize该属性时，将自动为您生成一个同名的支持ivar。您所拥有的代码本质上是声明 ivar 两次，这是无害但不必要的。

编辑:刚刚仔细查看了您的代码，您似乎在其他地方也犯了同样的错误:

self.calListArray = [calListArray init] ;

如上所述，这不会起作用。您无法通过调用 init 来初始化未分配的变量。您需要分配一个实例，然后在该实例上调用init。喜欢:

self.calListArray = [[NSMutableArray alloc] init];