我试图在iPhone模拟器中显示我的代码，但实际上它不起作用，不知道我错了什么。我认为我犯了一些基本的，初学者的错误，但这非常令人沮丧。我没有收到任何错误，但在我运行应用程序后它崩溃了，我在日志部分得到了这些内容:(我使用故事板和最新的Xcode版本和Cocoapods）
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<MainViewController 0x109f330c0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key overlays.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000102005495 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000101d6499e objc_exception_throw + 43
2 CoreFoundation 0x0000000102089919 -[NSException raise] + 9
3 Foundation 0x0000000101945530 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4 CoreFoundation 0x0000000102001400 -[NSArray makeObjectsPerformSelector:] + 224
5 UIKit 0x0000000100b6c8a6 -[UINib instantiateWithOwner:options:] + 1131
6 UIKit 0x0000000100a06b0c -[UIViewController _loadViewFromNibNamed:bundle:] + 245
7 UIKit 0x0000000100a07149 -[UIViewController loadView] + 112
8 UIKit 0x0000000100a073b7 -[UIViewController loadViewIfRequired] + 75
9 UIKit 0x0000000100a07777 -[UIViewController view] + 29
10 UIKit 0x000000010094796b -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x0000000100947c70 -[UIWindow _setHidden:forced:] + 282
12 UIKit 0x0000000100950ffa -[UIWindow makeKeyAndVisible] + 51
13 UIKit 0x000000010090cc98 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1788
14 UIKit 0x0000000100910a0c -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 660
15 UIKit 0x0000000100921d4c -[UIApplication handleEvent:withNewEvent:] + 3189
16 UIKit 0x0000000100922216 -[UIApplication sendEvent:] + 79
17 UIKit 0x0000000100912086 _UIApplicationHandleEvent + 578
18 GraphicsServices 0x000000010338a71a _PurpleEventCallback + 762
19 GraphicsServices 0x000000010338a1e1 PurpleEventCallback + 35
20 CoreFoundation 0x0000000101f87679 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
21 CoreFoundation 0x0000000101f8744e __CFRunLoopDoSource1 + 478
22 CoreFoundation 0x0000000101fb0903 __CFRunLoopRun + 1939
23 CoreFoundation 0x0000000101fafd83 CFRunLoopRunSpecific + 467
24 UIKit 0x00000001009102e1 -[UIApplication _run] + 609
25 UIKit 0x0000000100911e33 UIApplicationMain + 1010
26 GPUCoco 0x0000000100001ed3 main + 115
27 libdyld.dylib 0x00000001040465fd start + 1
28 ??? 0x0000000000000001 0x0 + 1
)
这是我的MainViewController.h
#import <UIKit/UIKit.h>
#import "TablViewCell.h"
#import <GPUImage.h>
@interface MainViewController : UIViewController {
NSMutableArray *filterNames;
}
//- (void) overlayFilter1;
//- (void) coolingLookup;
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UITableView *filtersTable;
- (IBAction)filters:(id)sender;
//- (IBAction)overlays:(id)sender;
- (IBAction)undo:(id)sender;
@end
MainViewController.m
#import "MainViewController.h"
@interface MainViewController ()
@end
@implementation MainViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
filterNames = [[NSMutableArray alloc] init];
[self coolingLookup];
}
//get number of sections in tableView from challenges array
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
//get number of rows by counting number of challenges
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return filterNames.count;
}
//setup cells in tableView
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
//setup cell
static NSString *CellIdentifier = @"TablViewCell";
TablViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSDictionary *filteredDictionary = [filterNames objectAtIndex:indexPath.row];
cell.imageFilename.text = [filteredDictionary objectForKey:@"imagefilename"];
cell.filteredImage.image = [filteredDictionary objectForKey:@"filteredImage"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSDictionary *filteredDictionary = [filterNames objectAtIndex:indexPath.row];
_imageView.image = [filteredDictionary objectForKey:@"filteredImage"];
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
/*
**********************************************************************************************
FILTERS
**********************************************************************************************
*/
- (void) coolingLookup {
UIImage *filteredimage;
NSString *filename = @"lookup_cooling.png";
GPUImagePicture *stillImageSource = [[GPUImagePicture alloc] initWithImage:_imageView.image];
GPUImagePicture *lookupImageSource = [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:filename]];
GPUImageLookupFilter *lookupFilter = [[GPUImageLookupFilter alloc] init];
[stillImageSource addTarget:lookupFilter];
[lookupImageSource addTarget:lookupFilter];
[stillImageSource processImage];
[lookupImageSource processImage];
[lookupFilter imageFromCurrentFramebuffer]; // megvaltozott a class neve
filteredimage = [lookupFilter imageFromCurrentFramebuffer];
NSDictionary *filteredDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:filteredimage, @"filteredImage", filename, @"filename", nil];
[filterNames insertObject:filteredDictionary atIndex:0];
[_filtersTable reloadData];
}
// /*
// **********************************************************************************************
// OVERLAYS
// **********************************************************************************************
// */
// - (void) overlayFilter1 {
// NSString *filename = @"fujiFrame.png";
//
// GPUImageMultiplyBlendFilter *overlayBlendFilter = [[GPUImageMultiplyBlendFilter alloc] init];
// GPUImagePicture *pic1 = [[GPUImagePicture alloc] initWithImage:_imageView.image];
// GPUImagePicture *pic2 = [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:filename]];
//
// [pic1 addTarget:overlayBlendFilter];
// [pic1 processImage];
// [pic2 addTarget:overlayBlendFilter];
// [pic2 processImage];
//
// UIImage *blendedImage = [overlayBlendFilter imageFromCurrentFramebufferWithOrientation::_imageView.image.imageOrientation];
//
// NSDictionary *filteredDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:blendedImage, @"filteredImage", filename, @"filename", nil];
//
// [filterNames insertObject:filteredDictionary atIndex:0];
//
// [_filtersTable reloadData];
// }
- (IBAction)undo:(id)sender {
_imageView.image = [UIImage imageNamed:@"demo01.png"];
[filterNames removeAllObjects];
[self coolingLookup];
}
// - (IBAction)overlays:(id)sender {
// [filterNames removeAllObjects];
// [self overlayFilter1];
// }
- (IBAction)filters:(id)sender {
[filterNames removeAllObjects];
[self coolingLookup];
}
- (void) applyFilter:(NSIndexPath *)indexPath {
if (indexPath.row == 0) {
[self coolingLookup];
}
}
@end
TablViewCell.h
#import <UIKit/UIKit.h>
@interface TablViewCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UIImageView *filteredImage;
@property (weak, nonatomic) IBOutlet UITextField *imageFilename;
@end
TablViewCell.m
#import "TablViewCell.h"
@implementation TablViewCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
}
return self;
}
- (void)awakeFromNib
{
// Initialization code
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
@end
答案 0 :(得分：0)
这是您复制粘贴或编辑连接到IBOutlet的类时遇到的常见错误。很可能是插座与代码之间的连接断开，这意味着您已在故事板上创建了一个插座，然后手动删除了代码中的属性。
该异常确实告诉你出了什么问题。故事板中的连接是在您选择的视图控制器中查找overlay属性，但由于它不存在，它会崩溃。
因此，请查看故事板上的视图控制器，然后尝试控制+单击上的所有元素并找到叠加连接。删除它，代码应该运行。
还要检查为视图控制器选择的类及其上的所有视图。您可以在Interface Builder中找到它。这也可能是导致崩溃的原因。
答案 1 :(得分：-1)
在Xcode中，当您查看故事板时，请转到实用程序栏（右侧），找到Connections检查器并检查连接是否断开。这真的是最容易出问题的。
答案 2 :(得分：-1)
我认为问题出在你的cellForRowAtIndexPath中，在这一行：
NSDictionary *filteredDictionary = [filterNames objectAtIndex:indexPath.row];
NSDictionary在特定索引处没有对象，而是具有键值对的对象。 将filteredDictionary更改为NSArray，或者将您在filteredDictionary中查找值的方式更改为
[filteredDictionary objectForKey:somekey];