我有一个以模态方式呈现的 UIViewController。当我查看内存分配 Instrument 时,显示视图时内存使用量会增加,但退出时内存不会释放。如果我不断打开和关闭视图,内存只会越来越高。Instruments 不会报告内存泄漏!这可能是什么原因造成的?视图控制器代码如下(我跳过了 didSelectRow 代码)。总是调用 Dealloc。
编辑 - 我正在使用 ARC
。H
#import <UIKit/UIKit.h>
@class OutlineTextUILabel;
@interface StoreViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {
int starCount;
NSMutableArray *_singleUseArray;
NSMutableArray *_fullUseArray;
}
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (weak, nonatomic) IBOutlet OutlineTextUILabel *starCountLbl;
- (IBAction)exitBtnPressed:(id)sender;
.m
#import "StoreViewController.h"
#import "NSUserDefaults+MPSecureUserDefaults.h"
#import "PowerUpCell.h"
#import "OutlineTextUILabel.h"
#import "PowerUpSingleton.h"
#import "PowerUp.h"
#define kPrefsNumberOfStars @"numberOfStars"
@interface StoreViewController ()
@end
@implementation StoreViewController
@synthesize tableView = _tableView;
@synthesize starCountLbl;
#pragma mark View Methods
- (void)viewDidLoad
{
[super viewDidLoad];
// Display star count
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
BOOL valid = NO;
starCount = [prefs secureIntegerForKey:kPrefsNumberOfStars valid:&valid];
if (!valid) {
NSLog(@"Stars Tampered With!");
self.starCountLbl.text = @"Err";
} else {
self.starCountLbl.text = [NSString stringWithFormat:@"%d",starCount];
}
// Tableview setup
CGRect frame2 = CGRectMake(0, 0, 320, 40);
UIView *footer = [[UIView alloc] initWithFrame:frame2];
footer.backgroundColor = [UIColor clearColor];
self.tableView.tableFooterView = footer;
self.tableView.opaque = NO;
self.tableView.backgroundView = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];
if (![[PowerUpSingleton sharedList] refreshArray]) {
NSLog(@"Error, %s",__FUNCTION__);
} else {
[self performSelectorOnMainThread:@selector(workOutSingleUseToDisplay) withObject:nil waitUntilDone:YES];
[self performSelectorOnMainThread:@selector(workOutFullUseToDisplay) withObject:nil waitUntilDone:YES];
[self.tableView reloadData];
}
}
- (void)workOutSingleUseToDisplay
{
_singleUseArray = [[NSMutableArray alloc] init];
for (PowerUp *pu in [[PowerUpSingleton sharedList] sharedArray]) {
if (!pu.fullUnlock) {
[_singleUseArray addObject:pu];
}
}
}
- (void)workOutFullUseToDisplay
{
_fullUseArray = [[NSMutableArray alloc] init];
for (PowerUp *pu in [[PowerUpSingleton sharedList] sharedArray]) {
if (pu.prefFullName != nil) {
[_fullUseArray addObject:pu];
}
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown);
}
- (void)viewDidUnload {
[self setTableView:nil];
[self setStarCountLbl:nil];
[super viewDidUnload];
}
#pragma mark TableView Setup Methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if (section == 0) {
return @"Single Use";
} else if (section == 1) {
return @"Use forever";
}
return nil;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section == 0) {
return [_singleUseArray count];
} else if (section == 1) {
return [_fullUseArray count];
}
return 0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *cellIdentifier;
if (indexPath.section == 0) {
cellIdentifier = @"powerUpCellSingleUse";
} else if (indexPath.section == 1) {
cellIdentifier = @"powerUpCell";
}
PowerUpCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[PowerUpCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
if (indexPath.section == 0) {
PowerUp *tmpPU = [_singleUseArray objectAtIndex:indexPath.row];
cell.descriptionLbl.text = tmpPU.displayName;
int cost = tmpPU.costSingle;
cell.costLbl.text = [NSString stringWithFormat:@"%d",cost];
if (cost > starCount) {
cell.costLbl.textColor = [UIColor redColor];
} else {
cell.costLbl.textColor = [UIColor blueColor];
}
int howMany = tmpPU.numberOwned;
cell.howManyLbl.text = [NSString stringWithFormat:@"%d",howMany];
} else if (indexPath.section == 1) {
PowerUp *tmpPU = [_fullUseArray objectAtIndex:indexPath.row];
cell.descriptionLbl.text = tmpPU.displayName;
int cost = tmpPU.costFull;
cell.costLbl.text = [NSString stringWithFormat:@"%d",cost];
if (cost > starCount) {
cell.costLbl.textColor = [UIColor redColor];
} else {
cell.costLbl.textColor = [UIColor blueColor];
}
if (tmpPU.fullUnlock) {
cell.costLbl.textColor = [UIColor greenColor];
cell.costLbl.text = @"---";
}
}
return cell;
}
#pragma mark -
- (IBAction)exitBtnPressed:(id)sender
{
[self dismissModalViewControllerAnimated:YES];
}
- (void)dealloc
{
NSLog(@"%s",__FUNCTION__);
self.tableView = nil;
self.starCountLbl = nil;
}
@end
编辑 ------------- 有些事情似乎不对。我已将 NSLog 添加到单元分配中,并且它从未被调用,即使单元已创建!
PowerUpCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
NSLog(@"new cell");
cell = [[PowerUpCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
编辑 7 月 1 日 ------ 我添加了一个导航控制器,现在使用推送而不是模式,这个问题仍然存在。我已经通过在视图之间来回移动几次来使用 Instruments 进行大量拍摄,似乎单元格仍然在附近徘徊,因为此屏幕截图显示手势识别器仍然存在于先前加载的视图中。