我知道还有其他人遇到此问题，并且我查看了大量有关此问题的帖子，但仍然无法弄清楚为什么我的应用程序不断崩溃。我只是不明白发生了什么='（我尝试清理所有内容，注释掉我的部分代码，并遵循此问题的其他答案但无济于事。这是我的 viewControler.h：
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController <UITextFieldDelegate>
//txt fields for max value and thread
@property (weak, nonatomic) IBOutlet UITextField *txtNumThreads;
@property (weak, nonatomic) IBOutlet UITextField *txtMaxValue;
//labels for time elapsed, primes found, and time
@property (weak, nonatomic) IBOutlet UILabel *lblTimeElapsed;
@property (weak, nonatomic) IBOutlet UILabel *lblPrimesFound;
@property (weak, nonatomic) IBOutlet UILabel *lblTime;
//actions for each of the buttons
- (IBAction)btnStart_click:(id)sender;
- (IBAction)btnClear_click:(id)sender;
- (IBAction)btnTime_click:(id)sender;
- (IBAction)btnShow_click:(id)sender;
//show button and text view to show results
@property (weak, nonatomic) IBOutlet UIButton *btnClear;
@property (weak, nonatomic) IBOutlet UIButton *btnShow;
@property (weak, nonatomic) IBOutlet UIButton *btnStart;
@property (weak, nonatomic) IBOutlet UITextView *txtViewResults;
//boolean to determine if the start button has been pressed once already
@property bool isComputing;
//for number of threads and max value
@property int NumThreads;
@property int MaxValue;
@property int sqRoot;
//array for primes and results
@property (strong, nonatomic) NSMutableArray *SieveArray;
@property (strong, nonatomic) NSMutableArray *PrimesAndThreads;
@end
这是我的 ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
//symbolic constants for max number of threads and max value
static const int MAX_NUM_THREADS = 4;
static const int MAX_VALUE = 9999;
@synthesize isComputing;
@synthesize sqRoot;
@synthesize NumThreads;
@synthesize MaxValue;
@synthesize SieveArray;
@synthesize PrimesAndThreads;
- (void)viewDidLoad
{
[super viewDidLoad];
//to dismiss the keyboard using tap gesture
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:@selector(dismissKeyboard)];
//add tap gesture
[self.view addGestureRecognizer:tap];
//start with isComputing being false
isComputing = false;
//allocate
SieveArray = [NSMutableArray array];
PrimesAndThreads = [NSMutableArray array];
}
//to dismiss the keyboard using resign first responder
-(void)dismissKeyboard {
[self.txtMaxValue resignFirstResponder];
[self.txtNumThreads resignFirstResponder];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//click event for the start button
- (IBAction)btnStart_click:(id)sender {
//clear contents of boxes
self.txtViewResults.text = @"";
if(SieveArray)
[SieveArray removeAllObjects];
if(PrimesAndThreads)
[PrimesAndThreads removeAllObjects];
[self.btnShow setEnabled:FALSE];
if([self txtNumThreads].text.length != 0 && [self txtMaxValue].text.length != 0)
{
//get the user entered data
NumThreads = [self.txtNumThreads.text intValue];
MaxValue = [self.txtMaxValue.text intValue];
if(NumThreads <= MAX_NUM_THREADS && MaxValue <= MAX_VALUE && NumThreads > 0)
{
//square root for the max number of divisions
sqRoot = sqrt(MaxValue);
//array for the algorithm
for(int i = 0; i < MaxValue+1; i++)
[SieveArray addObject:[NSNumber numberWithInt:1]];
switch (NumThreads) {
case 1:
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:0 Right:MaxValue ThreadNum:1];
});
break;
}
case 2:
{
int FirstHalf = MaxValue/2;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:0 Right:FirstHalf ThreadNum:1];
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:FirstHalf+1 Right:MaxValue ThreadNum:2];
});
break;
}
case 3:
{
int OneThird = MaxValue/3;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:0 Right:OneThird ThreadNum:1];
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:OneThird+1 Right:OneThird*2 ThreadNum:2];
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:(OneThird*2)+1 Right:MaxValue ThreadNum:3];
});
break;
}
case 4:
{
int OneFourth = MaxValue/4;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:0 Right:OneFourth ThreadNum:1];
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:OneFourth+1 Right:OneFourth*2 ThreadNum:2];
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:(OneFourth*2)+1 Right:OneFourth*3 ThreadNum:3];
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
[self SieveAlgorithm:(OneFourth*3)+1 Right:MaxValue ThreadNum:4];
});
break;
}
default:
break;
}
}
else
{
UIAlertView *ExceedMaxError = [[UIAlertView alloc] initWithTitle:@"Error" message:[NSString stringWithFormat:@"Please enter between 1 and %d threads, and a max of %d for value.", MAX_NUM_THREADS, MAX_VALUE] delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil, nil];
[ExceedMaxError show];
}
}
else
{
UIAlertView *blankTextsError = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please enter No Threads and Max Value." delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil, nil];
[blankTextsError show];
}
[self.btnShow setEnabled:TRUE];
}
//click event for the clear button
- (IBAction)btnClear_click:(id)sender {
self.txtMaxValue.text = @"";
self.txtNumThreads.text = @"";
self.txtViewResults.text = @"";
}
//click event for the time button
- (IBAction)btnTime_click:(id)sender {
NSDate *now = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterShortStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
self.lblTime.text = [NSString stringWithFormat:@"%@", [formatter stringFromDate:now]];
}
//click event for the show button
- (IBAction)btnShow_click:(id)sender {
//clear the result text view
self.txtViewResults.text = @"";
for(id object in PrimesAndThreads)
{
self.txtViewResults.text = [self.txtViewResults.text stringByAppendingString:[NSString stringWithFormat:@"%@\n", object]];
}
if(PrimesAndThreads)
[PrimesAndThreads removeAllObjects];
}
//Sieve Algorithm function
//Takes the left and right subscript of the range and performs the algorithm on SieveArray
-(void)SieveAlgorithm:(int)left Right:(int)right ThreadNum:(int)thread {
//get rid of multiples of i to square root of MaxValue
for(int i = 2; i <= sqRoot; i++)
{
for(int x = i+i; x <= right; x=x+i)
{
[SieveArray replaceObjectAtIndex:x withObject:[NSNumber numberWithInt:0]];
}
}
//add the primes to a string array for printing later
for(int l = left; l <= right; l++)
{
if([[SieveArray objectAtIndex:l] integerValue] == 1)
[PrimesAndThreads addObject:[NSString stringWithFormat:@"ThNum:%d Prime:%d", thread, l]];
}
}
@end
崩溃后，我被带到了这个：
libobjc.A.dylib`objc_msgSend:
0x10e608c: movl 8(%esp), %ecx
0x10e6090: movl 4(%esp), %eax
0x10e6094: testl %eax, %eax
0x10e6096: je 0x10e60e8 ; objc_msgSend + 92
0x10e6098: movl (%eax), %edx
0x10e609a: pushl %edi
0x10e609b: movl 8(%edx), %edi
0x10e609e: pushl %esi
0x10e609f: movl (%edi), %esi
0x10e60a1: movl %ecx, %edx
0x10e60a3: shrl $2, %edx
0x10e60a6: andl %esi, %edx
0x10e60a8: movl 8(%edi,%edx,4), %eax
0x10e60ac: testl %eax, %eax
0x10e60ae: je 0x10e60b9 ; objc_msgSend + 45
0x10e60b0: cmpl (%eax), %ecx
0x10e60b2: je 0x10e60d0 ; objc_msgSend + 68
0x10e60b4: addl $1, %edx
0x10e60b7: jmp 0x10e60a6 ; objc_msgSend + 26
0x10e60b9: popl %esi
0x10e60ba: popl %edi
0x10e60bb: movl 4(%esp), %edx
0x10e60bf: movl (%edx), %eax
0x10e60c1: jmp 0x10e60d9 ; objc_msgSend + 77
0x10e60c3: nopw %cs:(%eax,%eax)
0x10e60d0: movl 8(%eax), %eax
0x10e60d3: popl %esi
0x10e60d4: popl %edi
0x10e60d5: xorl %edx, %edx
0x10e60d7: jmpl *%eax
0x10e60d9: pushl %eax
0x10e60da: pushl %ecx
0x10e60db: pushl %edx
0x10e60dc: calll 0x10d3df3 ; _class_lookupMethodAndLoadCache3
0x10e60e1: addl $12, %esp
0x10e60e4: xorl %edx, %edx
0x10e60e6: jmpl *%eax
0x10e60e8: calll 0x10e60ed ; objc_msgSend + 97
0x10e60ed: popl %edx
0x10e60ee: movl 1007235(%edx), %eax
0x10e60f4: testl %eax, %eax
0x10e60f6: je 0x10e60fe ; objc_msgSend + 114
0x10e60f8: movl %eax, 4(%esp)
0x10e60fc: jmp 0x10e6098 ; objc_msgSend + 12
0x10e60fe: movl $0, %edx
0x10e6103: ret
将此突出显示为断点：
0x10e60b2: je 0x10e60d0 ; objc_msgSend + 68
这作为输出：
(lldb)
我真的没有第一个线索为什么它停止工作，它似乎工作了一分钟然后它停止了，但我也尝试将其清理干净并重置模拟器，但没有这样做..任何帮助都会非常感谢！！！