JavaScript化するObjective-Cについて

1. Web iOS 5
(id:ninjinkun / @ninjinkun)

2. Cocoa
• 10
• Next Step, Mac OSX
•
• ><
•

3. iOS
• iOS
•
• SDK
•
• Apple
• Web

4. • iOS
• iOS 4, iOS 5

5. • Objective-C JavaScript !
• iOS 5

6. • (Blocks)
JavaScript
• (GCD)
• (ARC)

7. (Blocks)
JavaScript
• JavaScript
• Ajax API
function sendRequest (url) {
var req = new XMLHttpRequest();
//
req.onreadystatechange = function(){
if (req.readyState == 4) {
if (req.status == 200) {
console.log("success");
}
}
};
req.open("GET", url);
req.send();
}

8. (Blocks)
Objective-C
• iOS 4 Objective-C
@interface Downloader : NSObject {
NSURLConnection *conn;
}
@end
@implementation Downloader
- (void)sentRequest:(NSURL *)url {
NSURLRequest *req = [NSURLRequest requestWithURL:url];
//
conn = [NSURLConnection connectionWithRequest:req delegate:self];
}
- (void)connection:( NSURLConnection *) connection didReceiveResponse:
( NSURLResponse *) response {
// delegate
NSLog(@"success");
}
@end

9. (Blocks)
Objective-C
• iOS 4 Objective-C
@interface Downloader : NSObject {
NSURLConnection *conn;
}
@end
@implementation Downloader
- (void)sentRequest:(NSURL *)url {
NSURLRequest *req = [NSURLRequest requestWithURL:url];
//
conn = [NSURLConnection connectionWithRequest:req delegate:self];
}
- (void)connection:( NSURLConnection *) connection didReceiveResponse:
( NSURLResponse *) response {
// delegate
NSLog(@"success");
}
@end

10. (Blocks)
iOS 4
• (Blocks)
•
• SDK Blocks
•
void(^hogeHandler)(NSArray *) = ^(NSArray *array){
NSLog(@"hoge");
};

11. (Blocks)
@interface Downloader : NSObject {
NSOperationQueue *queue;
}
@end
@implementation Downloader
- (void)sendRequest {
queue = [[NSOperationQueue alloc] init];
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL
URLWithString:@"http://www.apple.com/"]];
//
[NSURLConnection sendAsynchronousRequest:req queue:queue
completionHandler:^(NSURLResponse *res, NSData *data, NSError *err) {
if ([(NSHTTPURLResponse *)res statusCode] == 200) {
//
NSLog(@"success");
}
}];
}
@end

12. (Blocks)
@interface Downloader : NSObject {
NSOperationQueue *queue;
}
@end
@implementation Downloader
- (void)sendRequest {
queue = [[NSOperationQueue alloc] init];
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL
URLWithString:@"http://www.apple.com/"]];
//
[NSURLConnection sendAsynchronousRequest:req queue:queue
completionHandler:^(NSURLResponse *res, NSData *data, NSError *err) {
if ([(NSHTTPURLResponse *)res statusCode] == 200) {
//
NSLog(@"success");
}
}];
}
@end !

13. (GCD)
JavaScript
• JavaScript
•
•
•
• iOS
•
•
•

14. (GCD)
iOS 4
•
@interface FileReader : NSObject {
NSString *fileContent;
}
@property (nonatomic, assign) id delegate;
@end
@implementation FileReader
-(void)readFile:(NSString *)filename {
[self performSelectorInBackground:@selector(readFileOnBackground:)
withObject:filename];
}
//
-(void)readFileOnBackground:(NSString *)filename {
NSError *err = nil;
fileContent = [NSString stringWithContentsOfFile:filename
encoding:NSUTF8StringEncoding error:&err];
// UI
[delegate performSelectorOnMainThread:@selector(updateViewWithFile:)
withObject:fileContent waitUntilDone:NO];
}
@end

15. (GCD)
iOS 4
• Grand Central Dispatch
•
•
•
•
•

16. (GCD)
iOS 4
•
@interface FileReader : NSObject
@property (nonatomic, assign) id delegate;
@end
@implementation FileReader
-(void)readFile:(NSString *)filename {
//
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0),
^{
NSError *err = nil;
NSString *fileContent = [NSString stringWithContentsOfFile:filename
encoding:NSUTF8StringEncoding error:&err];
//
dispatch_async(dispatch_get_main_queue(), ^{
[delegate updateViewWithFile:fileContent];
});
});
}
@end

17. (ARC)
JavaScript
• GC
•
• Web

18. (ARC)
iOS 5
•
@interface User : NSObject {
NSString *name;
NSString *imageUrl;
}
@end
@implementation User
-(id)initWithDictionary:(NSDictionary *)dict {
self = [super init];
if (self) {
name = [[dict objectForKey:@"name"] retain]; //
imageUrl = [[dict objectForKey:@"image_url"] retain];
}
return self;
}
//
-(void)dealloc {
[name release];
[imageUrl release];
[super dealloc];
}
@end

19. (ARC)
iOS 5
•
@interface User : NSObject {
NSString *name;
NSString *imageUrl;
}
@end
@implementation User
-(id)initWithDictionary:(NSDictionary *)dict {
self = [super init];
if (self) {
name = [[dict objectForKey:@"name"] retain]; //
imageUrl = [[dict objectForKey:@"image_url"] retain];
}
return self;
}
//
-(void)dealloc {
[name release];
[imageUrl release];
[super dealloc];
}
@end

20. (ARC)
iOS 5
• Automatic Reference Counting
•
•
•
•

21. (ARC)
iOS 5
• !
@interface User : NSObject {
NSString *name;
NSString *imageUrl;
}
@end
@implementation User
-(id)initWithDictionary:(NSDictionary *)dict {
self = [super init];
if (self) {
name = [dict objectForKey:@"name"];
imageUrl = [dict objectForKey:@"image_url"];
}
return self;
}
//
@end

22. GC
• GC
• iOS
•
•
• CPU

23. • Objective-C JavaScript !
• … …
• Objective-C
•
• iOS
•