Webエンジニアから見たiOS5
3 likes1,358 views
The document discusses new features in iOS 5 including blocks, Grand Central Dispatch (GCD), and Automatic Reference Counting (ARC). Blocks allow performing operations asynchronously similar to JavaScript callbacks. GCD improves concurrency by executing tasks on background threads. ARC simplifies memory management by automatically releasing objects no longer in use.
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-8-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-9-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-11-320.jpg)
![(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 !](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-12-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-14-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-16-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-18-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-19-320.jpg)
![(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](https://image.slidesharecdn.com/webios5-111113175112-phpapp01/85/Web-iOS5-21-320.jpg)
Webエンジニアから見たiOS5
- 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 •