这是Objective-C中的标题代码:
@interface DocumentCatalogViewController : UITableViewController <UITableViewDelegate,UIAlertViewDelegate,UISearchBarDelegate,UIViewControllerPreviewingDelegate,UITableViewDataSource,UIDocumentInteractionControllerDelegate>
@property NSArray *filePathsArray;
@property NSArray *filePathsArrayCopy;
-(void) openTheFileInNativeViewer : (NSURL *) destinationURL;
-(void) openTheFileInOtherApps : (NSURL *) destinationURL;
@property UISearchBar *searchBar;
@property (strong, nonatomic) IBOutlet UIProgressView *progressView;
-(void)refreshDataAfterDownloading;
-(UIImage *) fileIconForTheCell : (NSString *) documentType;
-(UISearchBar *) setSearchBar;
-(void) openFile : (NSURL *) destinationURL doctype : (NSString *) documenttype;
+(id) sharedManager;
@end
这是Objective-C中的.m代码:
@interface DocumentCatalogViewController()
@property (nonatomic,strong) NSManagedObjectContext* managedObjectContext;
@property (strong) NSArray *files;
@property (strong) NSArray *SearchedFiles;
@property (nonatomic, strong) UIButton *button;
@property (nonatomic, strong) UIButton *cancelButton;
@property (nonatomic, strong) id previewingContext;
@property (nonatomic ,strong) UIDocumentInteractionController *documentInteractionController;
@property (nonatomic) BOOL hasCompatibleApps;
@property (nonatomic, strong) DocumentDownloadHandler *SessionWrapper;
@end
@implementation DocumentCatalogViewController
@dynamic refreshControl;
@synthesize searchBar;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:UITableViewStyleGrouped];
if (self) {
// Custom initialization
self.title = NSLocalizedString(@"mdm.agent.common.documents", nil);
self.progressView =[[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleBar];
CGAffineTransform transform = CGAffineTransformMakeScale(1.0f, 5.0f);
self.progressView.transform = transform;
[self.progressView setFrame:CGRectMake(0,60, self.tableView.bounds.size.width, 10)];
self.progressView.progressTintColor=[UIColor greenColor];
}
return self;
}
+ (id) sharedManager {
static dispatch_once_t onceToken;
static DocumentCatalogViewController *sharedCatalogManager;
dispatch_once(&onceToken, ^{
sharedCatalogManager = [[[self class] alloc] init];
});
return sharedCatalogManager;
}
- (instancetype)init {
self = [super init];
return self;
}
在将其转换为Swift时,我无法转换单例函数,因为dispatch_once
已弃用。所以我创建了一个静态变量,如下所示。
swift中的代码段
class DocumentCatalogViewController: UITableViewController, UIViewControllerPreviewingDelegate, UISearchBarDelegate, UIDocumentInteractionControllerDelegate, UIAlertViewDelegate {
var filePathsArray = [Any]()
var filePathsArrayCopy = [Any]()
var searchBar: UISearchBar?
@IBOutlet var progressView: UIProgressView!
var managedObjectContext: NSManagedObjectContext?
var files = [File]()
var searchedFiles = [File]()
var button: UIButton?
var cancelButton: UIButton?
var previewingContext: Any?
var documentInteractionController: UIDocumentInteractionController
var hasCompatibleApps = false
var sessionWrapper: DocumentDownloadHandler?
//here
static let shared = DocumentCatalogViewController()
//but this shows a error **Cannot invoke initializer for type 'DocumentCatalogViewController' with no arguments**
override init(style: UITableViewStyle) {
super.init(style: .grouped)
title = NSLocalizedString("mdm.agent.common.documents", comment: "")
progressView = UIProgressView(progressViewStyle: .bar)
let transform = CGAffineTransform(scaleX: 1.0, y: 5.0)
progressView.transform = transform
progressView.frame = CGRect(x: 0, y: 60, width: tableView.bounds.size.width, height: 10)
progressView.progressTintColor = UIColor.green
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
//fatalError("init(coder:) has not been implemented")
}
因此,我创建了一个空的初始化函数init()
init(){
super.init()
}
然后它显示错误说:
必须调用超类'UITableViewController'
的指定初始值设定项
答案 0 :(得分:0)
您正在调用UITableViewController超类不支持的super.init()
,将其更改为initWithStyle