我正在尝试使用两个按钮来循环显示一系列图像。我正在使用buttonPressed函数来识别左或右按钮的标记，并应更改显示的图像。问题是，当向右移动（递增数组）时，该函数可以正常工作，但如果我尝试向左移动（递减），程序将崩溃。我已经尝试更改变量初始化的值和用于循环数组的值，但似乎没有什么能解决它。非常感谢任何帮助。
·H
// FirstViewController.h
// TabTemplate
//
// Created by Paul R Woidke on 6/1/11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
#include <stdlib.h>
@interface FirstViewController : UIViewController {
UIImageView* hat;
UIImageView* shirt;
UIImageView* pants;
UIImageView* shoes;
NSArray *hatArray;
NSArray *shirtArray;
NSArray *pantsArray;
NSArray *shoesArray;
}
@property (nonatomic, retain) IBOutlet UIImageView* hat;
@property (nonatomic, retain) IBOutlet UIImageView* shirt;
@property (nonatomic, retain) IBOutlet UIImageView* pants;
@property (nonatomic, retain) IBOutlet UIImageView* shoes;
@property (nonatomic, retain) IBOutlet NSArray* hatArray;
@property (nonatomic, retain) IBOutlet NSArray* shirtArray;
@property (nonatomic, retain) IBOutlet NSArray* pantsArray;
@property (nonatomic, retain) IBOutlet NSArray* shoesArray;
- (IBAction)buttonPressed:(id) sender;
- (IBAction)lockButtonPressed:(id) sender;
- (IBAction)weatherButtonPressed:(id) sender;
- (IBAction)randomizeButtonPressed:(id) sender;
@end
的.m
// FirstViewController.m
// TabTemplate
//
// Created by Paul R Woidke on 6/1/11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "FirstViewController.h"
@implementation FirstViewController
@synthesize hat;
@synthesize shirt;
@synthesize pants;
@synthesize shoes;
@synthesize hatArray;
@synthesize shirtArray;
@synthesize pantsArray;
@synthesize shoesArray;
NSInteger hatImage;
NSInteger shirtImage;
NSInteger pantsImage;
NSInteger shoesImage;
-(void) displayOutfit {
UIImage *hatImg = [hatArray objectAtIndex:hatImage];
[hat setImage:hatImg];
UIImage *shirtImg = [shirtArray objectAtIndex:shirtImage];
[shirt setImage:shirtImg];
UIImage *pantsImg = [pantsArray objectAtIndex:pantsImage];
[pants setImage:pantsImg];
UIImage *shoesImg = [shoesArray objectAtIndex:shoesImage];
[shoes setImage:shoesImg];
}
- (IBAction)buttonPressed:(id) sender {
NSInteger senderLabel = [sender tag];
switch (senderLabel) {
//Going right
case 2:
NSLog(@"Hat number: %d", hatImage);
NSLog(@"Hat Array count: %d", [hatArray count]);
if (hatImage == [hatArray count])
hatImage = 0;
UIImage *hatImg2 = [hatArray objectAtIndex:hatImage];
[hat setImage:hatImg2];
hatImage++;
break;
case 4:
if (shirtImage == [shirtArray count])
shirtImage = 0;
UIImage *shirtImg2 = [shirtArray objectAtIndex:shirtImage];
[shirt setImage:shirtImg2];
shirtImage++;
break;
case 6:
if (pantsImage == [pantsArray count])
pantsImage = 0;
UIImage *pantsImg = [pantsArray objectAtIndex:pantsImage];
[pants setImage:pantsImg];
pantsImage++;
break;
case 8:
if (shoesImage == [shoesArray count])
shoesImage = 0;
UIImage *shoesImg2 = [shoesArray objectAtIndex:shoesImage];
[shoes setImage:shoesImg2];
shoesImage++;
break;
//Going left
case 1:
if (hatImage == 0)
hatImage = 3;
UIImage *hatImg = [hatArray objectAtIndex:hatImage];
[hat setImage:hatImg];
hatImage--;
break;
case 3:
if ((shirtImage) == 0)
shirtImage = [shirtArray count];
UIImage *shirtImg = [shirtArray objectAtIndex:shirtImage];
[shirt setImage:shirtImg];
shirtImage--;
break;
case 5:
if ((pantsImage) == 0)
pantsImage = [pantsArray count];
UIImage *pantsImg2 = [pantsArray objectAtIndex:pantsImage];
[pants setImage:pantsImg2];
pantsImage--;
break;
case 7:
if ((shoesImage) == 0)
shoesImage = [shoesArray count];
UIImage *shoesImg = [shoesArray objectAtIndex:shoesImage];
[shoes setImage:shoesImg];
shoesImage--;
break;
}
}
- (IBAction)lockButtonPressed:(id) sender {
NSLog(@"Lock Button Pressed");
}
- (IBAction)weatherButtonPressed:(id) sender {
NSLog(@"Weather Button Pressed");
}
- (IBAction)randomizeButtonPressed:(id) sender {
NSLog(@"Randomize Button Pressed");
int randHat = rand() % [hatArray count];
int randShirt = rand() % [shirtArray count];
int randPants = rand() % [pantsArray count];
int randShoes = rand() % [shoesArray count];
NSLog(@"hat %d\nshirt %d\npants %d\nshoes %d", randHat, randShirt, randPants, randShoes);
hatImage = randHat;
shirtImage = randShirt;
pantsImage = randPants;
shoesImage = randShoes;
[self displayOutfit];
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
//Generate image arrays
hatArray = [[NSArray arrayWithObjects:
[UIImage imageNamed:@"h1.png"],
[UIImage imageNamed:@"h2.png"],
[UIImage imageNamed:@"h3.png"],
nil] retain];
shirtArray = [[NSArray arrayWithObjects:
[UIImage imageNamed:@"s1.png"],
[UIImage imageNamed:@"s2.png"],
[UIImage imageNamed:@"s3.png"],
[UIImage imageNamed:@"s4.png"],
[UIImage imageNamed:@"s5.png"],
[UIImage imageNamed:@"s6.png"],
nil] retain];
pantsArray = [[NSArray arrayWithObjects:
[UIImage imageNamed:@"p1.png"],
[UIImage imageNamed:@"p2.png"],
[UIImage imageNamed:@"p3.png"],
[UIImage imageNamed:@"p4.png"],
nil] retain];
shoesArray = [[NSArray arrayWithObjects:
[UIImage imageNamed:@"ss1.png"],
[UIImage imageNamed:@"ss2.png"],
[UIImage imageNamed:@"ss3.png"],
nil] retain];
hatImage = 0;
shirtImage = 0;
pantsImage = 0;
shoesImage = 0;
UIImage *hatImg = [hatArray objectAtIndex:hatImage];
[hat setImage:hatImg];
UIImage *shirtImg = [shirtArray objectAtIndex:shirtImage];
[shirt setImage:shirtImg];
UIImage *pantsImg = [pantsArray objectAtIndex:pantsImage];
[pants setImage:pantsImg];
UIImage *shoesImg = [shoesArray objectAtIndex:shoesImage];
[shoes setImage:shoesImg];
[super viewDidLoad];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (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.hat = nil;
self.shirt = nil;
self.pants = nil;
self.shoes = nil;
self.hatArray = nil;
self.shirtArray = nil;
self.pantsArray = nil;
self.shoesArray = nil;
}
- (void)dealloc {
[hat release];
[shirt release];
[pants release];
[shoes release];
[hatArray release];
[shirtArray release];
[pantsArray release];
[shoesArray release];
[super dealloc];
}
@end
控制台输出（显示数组计数和当前图像的值）：
[Session started at 2011-06-16 16:30:50 -0400.]
2011-06-16 16:31:03.192 TabTemplate[2478:207] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSArray objectAtIndex:]: index 3 beyond bounds [0 .. 2]'
*** Call stack at first throw:
(
0 CoreFoundation 0x00db3be9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f085c2 objc_exception_throw + 47
2 CoreFoundation 0x00da980c -[__NSArrayI objectAtIndex:] + 236
3 TabTemplate 0x000026c8 -[FirstViewController buttonPressed:] + 569
4 UIKit 0x002bca6e -[UIApplication sendAction:to:from:forEvent:] + 119
5 UIKit 0x0034b1b5 -[UIControl sendAction:to:forEvent:] + 67
6 UIKit 0x0034d647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
7 UIKit 0x0034c1f4 -[UIControl touchesEnded:withEvent:] + 458
8 UIKit 0x002e10d1 -[UIWindow _sendTouchesForEvent:] + 567
9 UIKit 0x002c237a -[UIApplication sendEvent:] + 447
10 UIKit 0x002c7732 _UIApplicationHandleEvent + 7576
11 GraphicsServices 0x016e9a36 PurpleEventCallback + 1550
12 CoreFoundation 0x00d95064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
13 CoreFoundation 0x00cf56f7 __CFRunLoopDoSource1 + 215
14 CoreFoundation 0x00cf2983 __CFRunLoopRun + 979
15 CoreFoundation 0x00cf2240 CFRunLoopRunSpecific + 208
16 CoreFoundation 0x00cf2161 CFRunLoopRunInMode + 97
17 GraphicsServices 0x016e8268 GSEventRunModal + 217
18 GraphicsServices 0x016e832d GSEventRun + 115
19 UIKit 0x002cb42e UIApplicationMain + 1160
20 TabTemplate 0x00002012 main + 84
21 TabTemplate 0x00001f92 start + 54
)
terminate called after throwing an instance of 'NSException'
[Session started at 2011-06-16 16:31:13 -0400.]
2011-06-16 16:31:15.966 TabTemplate[2481:207] Hat number: 0
2011-06-16 16:31:15.968 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:16.390 TabTemplate[2481:207] Hat number: 1
2011-06-16 16:31:16.391 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:16.790 TabTemplate[2481:207] Hat number: 2
2011-06-16 16:31:16.791 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:17.446 TabTemplate[2481:207] Hat number: 3
2011-06-16 16:31:17.447 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:17.902 TabTemplate[2481:207] Hat number: 1
2011-06-16 16:31:17.903 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:18.199 TabTemplate[2481:207] Hat number: 2
2011-06-16 16:31:18.199 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:18.526 TabTemplate[2481:207] Hat number: 3
2011-06-16 16:31:18.527 TabTemplate[2481:207] Hat Array count: 3
2011-06-16 16:31:20.503 TabTemplate[2481:207] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSArray objectAtIndex:]: index 3 beyond bounds [0 .. 2]'
*** Call stack at first throw:
(
0 CoreFoundation 0x00db3be9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f085c2 objc_exception_throw + 47
2 CoreFoundation 0x00da980c -[__NSArrayI objectAtIndex:] + 236
3 TabTemplate 0x000026c8 -[FirstViewController buttonPressed:] + 569
4 UIKit 0x002bca6e -[UIApplication sendAction:to:from:forEvent:] + 119
5 UIKit 0x0034b1b5 -[UIControl sendAction:to:forEvent:] + 67
6 UIKit 0x0034d647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
7 UIKit 0x0034c1f4 -[UIControl touchesEnded:withEvent:] + 458
8 UIKit 0x002e10d1 -[UIWindow _sendTouchesForEvent:] + 567
9 UIKit 0x002c237a -[UIApplication sendEvent:] + 447
10 UIKit 0x002c7732 _UIApplicationHandleEvent + 7576
11 GraphicsServices 0x016e9a36 PurpleEventCallback + 1550
12 CoreFoundation 0x00d95064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
13 CoreFoundation 0x00cf56f7 __CFRunLoopDoSource1 + 215
14 CoreFoundation 0x00cf2983 __CFRunLoopRun + 979
15 CoreFoundation 0x00cf2240 CFRunLoopRunSpecific + 208
16 CoreFoundation 0x00cf2161 CFRunLoopRunInMode + 97
17 GraphicsServices 0x016e8268 GSEventRunModal + 217
18 GraphicsServices 0x016e832d GSEventRun + 115
19 UIKit 0x002cb42e UIApplicationMain + 1160
20 TabTemplate 0x00002012 main + 84
21 TabTemplate 0x00001f92 start + 54
)
terminate called after throwing an instance of 'NSException'
答案 0 :(得分：2)
在“向左”的情况下，您将数组索引设置为超出范围。例如：
if ((shirtImage) == 0)
shirtImage = [shirtArray count];
数组中的最后一项具有索引[arrayObj count] - 1。
事实上，你将shirtImage的值设置在1..arrayLength范围内的任何位置，它应该在0..arrayLength-1范围内。我建议你先增加/减少你的索引，然后检查它的边界，然后索引到数组。例如：
case 2:
// increment the index
hatImage++;
// wrap around if you've gone beyond the bounds of the array
if (hatImage == [hatArray count])
hatImage = 0;
// Index into the array
[hat setImage:[hatArray objectAtIndex:hatImage]];
答案 1 :(得分：0)
NSRangeException - 这意味着你已经超出了数组的范围。
旁白：您将这些声明为IBOutlet属性。你把它们挂钩到什么地方？
@property (nonatomic, retain) IBOutlet NSArray* hatArray;
@property (nonatomic, retain) IBOutlet NSArray* shirtArray;
@property (nonatomic, retain) IBOutlet NSArray* pantsArray;
@property (nonatomic, retain) IBOutlet NSArray* shoesArray;