我的代码：

1. #import "FirstViewController.h"
3. @implementation FirstViewController
5. @synthesize myHelpfile = ivHelpfile; //UIAlertView
6. @synthesize myAboutfile = ivAboutfile; //UIAlertView
7. @synthesize myNoarea = ivNoarea; //UIAlertView
8. @synthesize myMap = ivMap; //UIImageView
9. @synthesize myAreapick = ivAreapick; //UIActionSheet
10. @synthesize myAdvancedmode = ivAdvancedmode; //NSString
11. @synthesize myAreaset = ivAreaset; //NSString
12. @synthesize myAreaarray = ivAreaarray; //NSArray
14. @synthesize appSettingsViewController, settingsViewController;
16. - (void)viewDidLoad {
17.     [super viewDidLoad];
18.     self.title = @"Wildlife";
20.     NSString *area  = [[NSUserDefaults standardUserDefaults] stringForKey:@"mulValue"];
21.     [self setMyAreaset:area];
23.     if ([self myAreaset] == nil) { //check if any region is selected. If not, push UIActionsheet
25.     NSArray *array = [[NSArray alloc] initWithObjects:      // creating array for different regions
26.                        [NSString stringWithString:@"Region 1"],
27.                        [NSString stringWithString:@"Region 2"],
28.                        [NSString stringWithString:@"Region 3"],
29.                        [NSString stringWithString:@"Region 4"],
30.                        [NSString stringWithString:@"Region 5"],
31.                        [NSString stringWithString:@"Region 6"],nil];
32.     [self setMyAreaarray:array];
33.     [array release], array = nil;      
34.     NSLog(@"Built areaselectArray");
35.     NSLog(@"Values of areaselectArray are %@",[self myAreaarray]);
37.     UIActionSheet *areaselect = [[UIActionSheet alloc] initWithTitle:@"Select your current area" //creation of popup Area Selection
38.                                                             delegate:self
39.                                                    cancelButtonTitle:nil
40.                                               destructiveButtonTitle:nil
41.                                                    otherButtonTitles:nil];
42.         [self setMyAreapick:areaselect];
43.         [areaselect release], areaselect = nil;
45.     int countarray = [[self myAreaarray] count];
47.     for (int i = 0; i < countarray; i++) { //building list from array
49.         [[self myAreapick] addButtonWithTitle:[[self myAreaarray] objectAtIndex:i]];
51.     }
52.     [[self myAreapick] addButtonWithTitle:@"Cancel"];
53.     [self myAreapick].cancelButtonIndex = countarray;
54.     [[self myAreapick] showInView:self.view];//show the general UIActionSheet instance
55.     NSLog(@"Out of viewDidLoad");
56.     }
57.     else {
58.         NSLog(@"Area is %@, no need for areaselectArray",area);
59.         }   
61. }
64. -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger )buttonIndex
65. {
66.     int countarray = [[self myAreaarray] count];
68.     if (buttonIndex != countarray) { //cancel button is at countarray, so for anything that is not cancel, do:
69.             NSString *area = [[self myAreaarray] objectAtIndex:(buttonIndex)];
70.             [self setMyAreaset:area];
71.             [[NSUserDefaults standardUserDefaults] setObject:[self myAreaset] forKey:@"mulValue"];
72.             [[NSUserDefaults standardUserDefaults] synchronize]; //sync
73.             NSLog(@"Released areaselectArray");
74.         }
75.     else {
76.     }
78. }

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怎么回事呢？

1. UIActionSheet *as = [[UIActionSheet alloc] initWithTitle:@"Test" delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
3. for (int i = 0; i < 100; i++) {
4.      [as addButtonWithTitle:[NSString stringWithFormat:@"Button %i", i]];
5. }
6. as.cancelButtonIndex = 99;
7. as.destructiveButtonIndex = 0;
9. [as showInView:self.view];
10. [as release];

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使用代码分析工具跑一下，查找就可以找到大部分 的内存泄露问题。