GCD和KVO问题
我的应用程序想要获取iphone的相册列表以及某些相册中的所有照片。
在应用程序中，我枚举了iPhone的一张专辑中的照片。 由于某些相册可能有很多照片，考虑到性能，我使用GCD：dispatch_async。 但是，当KVO调用的tableview单元更新时，它总是崩溃。 我不知道我是否以错误的方式使用KVO或GCD。
现在或者我使用performSelectorInBackground：替换dispatch_async。 现在应用程序不会崩溃，但应用程序的性能很差：只有在触摸它时才会显示单元格的标题，或者在有许多照片时滚动tableview。 换句话说，主线程必须被阻塞。
附件是代码，核心代码在AlbumListViewController.m中。
任何人都可以帮我检查一下吗？
我只想知道：1为什么如果使用dispatch_async 2，应用程序崩溃了如何在许多照片的情况下提高性能。
谢谢。
以下是我的代码：
//
// RootViewController.h
// AlbumDemo
#import
@interface RootViewController : UITableViewController {
NSMutableArray *_listArray;
}
@property (nonatomic, retain) NSMutableArray *listArray;
@end
// RootViewController.m
#import "RootViewController.h"
#import
#import "AlbumListViewController.h"
NSString *thumnail = @"thumnail";
NSString *albumName = @"albumName";
NSString *albumNum = @"albumNum";
NSString *albumGroup = @"albumGroup";
@implementation RootViewController
@synthesize listArray = _listArray;
#pragma -
#pragma Function
- (void)setUp
{
_listArray = [[NSMutableArray alloc] initWithCapacity:1];
self.title = @"Albums";
}
- (void)fetchAlbumList
{
ALAssetsLibrary *assetLib = [[[ALAssetsLibrary alloc] init] autorelease];
ALAssetsFilter *fileter = [ALAssetsFilter allPhotos];
[assetLib enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
if (group)
{
[group setAssetsFilter:fileter];
NSString *_groupName = [group valueForProperty:ALAssetsGroupPropertyName];
NSNumber *_groupNum = [NSNumber numberWithInteger:[group numberOfAssets]];
UIImage *_groupImage = [UIImage imageWithCGImage:[group posterImage]];
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:_groupName,albumName,_groupNum,albumNum,_groupImage,thumnail,group,albumGroup, nil];
[_listArray addObject:dic];
[self.tableView reloadData];
}
else
{
NSLog(@"_listArray :%@",_listArray);
}
}
failureBlock:^(NSError *error)
{
NSLog(@"Error: %@", error);;
}
];
}
#pragma -
#pragma ViewController lift cycle
- (void)viewDidLoad
{
[super viewDidLoad];
[self setUp];
[self fetchAlbumList];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [_listArray count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UILabel *nameLab = nil;
UILabel *numLab = nil;
UIImageView *thumnailImage = nil;
UIFont *font = [UIFont boldSystemFontOfSize:18];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
thumnailImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0,50, 50)];
thumnailImage.tag = 100;
[cell.contentView addSubview:thumnailImage];
[thumnailImage release];
nameLab = [[UILabel alloc] initWithFrame:CGRectMake(60, 10, 100, 30)];
nameLab.tag = 200;
nameLab.backgroundColor = [UIColor clearColor];
nameLab.font = font;
[cell.contentView addSubview:nameLab];
[nameLab release];
numLab = [[UILabel alloc] initWithFrame:CGRectMake(200, 10, 50, 30)];
numLab.tag = 300;
numLab.backgroundColor = [UIColor clearColor];
numLab.textColor = [UIColor grayColor];
numLab.font = font;
[cell.contentView addSubview:numLab];
[numLab release];
}
else
{
thumnailImage = (UIImageView *)[cell.contentView viewWithTag:100];
nameLab = (UILabel *)[cell.contentView viewWithTag:200];
numLab = (UILabel *)[cell.contentView viewWithTag:300];
}
NSDictionary *dic = [self.listArray objectAtIndex:indexPath.row];
thumnailImage.image = (UIImage *)[dic valueForKey:thumnail];
NSString *title = [dic valueForKey:albumName];
CGSize titleSize = [title sizeWithFont:font];
CGRect rect = nameLab.frame;
rect.size = titleSize;
nameLab.frame = rect;
nameLab.text = title;
rect = numLab.frame;
rect.origin.x = 60 + nameLab.frame.size.width + 10;
numLab.frame = rect;
numLab.text = [NSString stringWithFormat:@"(%d)",[[dic valueForKey:albumNum] intValue]];
// Configure the cell.
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *dic = [self.listArray objectAtIndex:indexPath.row];
AlbumListViewController *viewController = [[AlbumListViewController alloc] initWithAssetGroup:[dic valueForKey:albumGroup]];
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc
{
My_Release (_listArray);
[super dealloc];
}
@end
// AlbumListViewController.h
// AlbumDemo
#import
#import
@interface AlbumListViewController : UITableViewController {
NSMutableArray *_marr;
ALAssetsGroup *_assetsGroup;
}
@property (nonatomic, retain) NSMutableArray *list;
@property (nonatomic, retain) ALAssetsGroup *assetsGroup;
- (id)initWithAssetGroup:(ALAssetsGroup *)group;
@end
// AlbumListViewController.m
// AlbumDemo
#import "AlbumListViewController.h"
@interface PhotoObj : NSObject {
NSString *_name;
UIImage *_thumbnail;
UIImage *_fullImage;
}
@property (nonatomic, copy ) NSString *name;
@property (nonatomic, retain) UIImage *thumbnail;
@property (nonatomic, retain) UIImage *fullImage;
@end
@implementation PhotoObj
@synthesize name = _name;
@synthesize thumbnail = _thumbnail,fullImage = _fullImage;
- (void)dealloc
{
My_Release(_thumbnail);
My_Release(_fullImage);
My_Release(_name);
[super dealloc];
}
@end
@interface AlbumListViewController()
- (NSMutableArray*)list;
- (NSUInteger)countOfList;
- (id)objectInListAtIndex:(NSUInteger)idx;
- (void)insertObject:(id)anObject inListAtIndex:(NSUInteger)idx;
- (id)objectInListAtIndex:(NSUInteger)idx;
- (void)removeObjectFromListAtIndex:(NSUInteger)idx;
- (void)replaceObjectInListAtIndex:(NSUInteger)idx withObject:(id)anObject;
- (void)setList:(NSMutableArray *)_arr;
@end
@implementation AlbumListViewController
@synthesize assetsGroup = _assetsGroup;
- (id)initWithAssetGroup:(ALAssetsGroup *)group
{
self = [self initWithStyle:UITableViewStylePlain];
if (self )
{
_marr = [[NSMutableArray alloc] initWithCapacity:1];
self.assetsGroup = group;
self.tableView.delegate = self;
self.tableView.dataSource = self;
}
return self;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)dealloc
{
My_Release(_marr);
My_Release(_assetsGroup);
[self removeObserver:self forKeyPath:@"list"];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
}
#pragma mark - View lifecycle
- (void)parseAssetGroup
{
[_marr removeAllObjects];
[self.assetsGroup enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result)
{
PhotoObj *obj = [[PhotoObj alloc] init];
obj.thumbnail = [UIImage imageWithCGImage:[result thumbnail]];
ALAssetRepresentation *represention = [result defaultRepresentation];
obj.fullImage = [UIImage imageWithCGImage:[represention fullScreenImage]];
obj.name = [[represention url] absoluteString];
[self willChangeValueForKey:@"list"];
[self insertObject:obj inListAtIndex:[_marr count]];
[self didChangeValueForKey:@"list"];
My_Release(obj);
}
}];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self addObserver:self forKeyPath:@"list" options:NSKeyValueObservingOptionNew |NSKeyValueObservingOptionOld context:NULL];
/*
if performSelectorInBackground, the perofrmance is poor
as the title of the cell will be shown in a long time and it now seems the main thread is blocked
*/
[self performSelectorInBackground:@selector(parseAssetGroup) withObject:nil];
/*
using dispatch_async it always crashes
as it says the sth is wrong with the tableview update
*/
// dispatch_async(dispatch_get_main_queue(), ^{
// [self parseAssetGroup];
// });
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
#pragma mark - Table view data source
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [_marr count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UIImageView *thumbNail = nil;
UILabel *nameLab = nil;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
thumbNail = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
thumbNail.tag = 99;
[cell.contentView addSubview:thumbNail];
[thumbNail release];
nameLab = [[UILabel alloc] initWithFrame:CGRectMake(60, 10, 240, 40)];
nameLab.numberOfLines = 2;
nameLab.font = [UIFont systemFontOfSize:16];
nameLab.tag = 199;
[cell.contentView addSubview:nameLab];
[nameLab release];
}
else
{
thumbNail = (UIImageView *)[cell.contentView viewWithTag:99];
nameLab = (UILabel *)[cell.contentView viewWithTag:199];
}
// Configure the cell...
PhotoObj *obj = [_marr objectAtIndex:indexPath.row];
nameLab.text = obj.name;
thumbNail.image = obj.thumbnail;
return cell;
}
#pragma mark -
- (NSUInteger)countOfList
{
return [_marr count];
}
- (NSMutableArray*)list
{
return _marr;
}
- (void)setList:(NSMutableArray *)_arr
{
if (_marr != _arr)
{
[_marr release];
_marr = _arr;
}
}
- (id)objectInListAtIndex:(NSUInteger)idx
{
return [_marr objectAtIndex:idx];
}
- (void)insertObject:(id)anObject inListAtIndex:(NSUInteger)idx
{
if ([NSThread isMainThread])
{
NSLog(@"insert main thread");
}
else
{
NSLog(@"insert not main thread");
}
[_marr insertObject:anObject atIndex:idx];
}
- (void)removeObjectFromListAtIndex:(NSUInteger)idx
{
[_marr removeObjectAtIndex:idx];
}
- (void)replaceObjectInListAtIndex:(NSUInteger)idx withObject:(id)anObject
{
[_marr replaceObjectAtIndex:idx withObject:anObject];
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
NSIndexSet *indices = [change objectForKey:NSKeyValueChangeIndexesKey];
if (indices == nil)
return; // Nothing to do
// Build index paths from index sets
NSUInteger indexCount = [indices count];
NSUInteger buffer[indexCount];
[indices getIndexes:buffer maxCount:indexCount inIndexRange:nil];
NSMutableArray *indexPathArray = [NSMutableArray array];
for (int i = 0; i 今天我遇到了同样的问题。 总之，原因是你不能做UIKit相关的任务，比如更新一个表格，或者在我的情况下是一个Textview，来自后台调度队列。 查看下面的链接了解更多详情。
比较GCD与performSelectorInBackground：dispatch_async不在后台
一个可能的解决方案如下：不是将更新块中的新数据直接分配给导致崩溃的KVO变量，而是从更新块内部派发另一个将其更新到主队列的块。 如果使用dispatch_async_f函数执行此操作，则可以将指针指向数据作为上下文。
喜欢这个：
dispatch_async(yourQueue, ^() {
NSArray *data;
// do stuff to alloc and fill the array
// ...
dispatch_async(dispatch_get_main_queue(), ^() {
myObj.data = data; // the assignment, which triggers the KVO.
});
});
对我来说，这个工作不需要保留和发布数据。 不确定，如果这是正确的。
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