第二十四個夏天後: objective c

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2015年11月25日星期三

iOS 開發筆記 - 把玩 Chromecast SDK 播放網路連結（圖片、影片）

買了一隻 Chromecast ，除了試用產品外，也想試試看 Chromecast SDK 。快速翻了一下 iOS App Development - ios sender 文件，還是不得其門而入 XD 最後還是乖乖看範例程式：https://github.com/googlecast/CastVideos-ios

簡言之，我是使用 Cocoapods 管理 Chromecast SDK 的:


$ vim Podfile

pod 'google-cast-sdk'

pod 'google-cast-remote-display-sdk'

接著寫一點程式，參考 CastVideos-ios 內的 CastDeviceController 範例了解整個流程。

總之，若要簡單播放一個 URL ，需要依序完成以下動作：

搜尋 chromecast device 並實作 GCKDeviceScannerListener 偵測裝置

GCKFilterCriteria *filterCriteria = [GCKFilterCriteria criteriaForAvailableApplicationWithID:kGCKMediaDefaultReceiverApplicationID];
self.chromecastScanner = [[GCKDeviceScanner alloc] initWithFilterCriteria:filterCriteria];
[self.chromecastScanner addListener:self];
[self.chromecastScanner startScan];

透過 - (void)deviceDidComeOnline:(GCKDevice *)device 偵測到後，進行連線

self.chromecastManager = [[GCKDeviceManager alloc] initWithDevice:self.chooseDevice clientPackageName:[NSBundle mainBundle].bundleIdentifier];
self.chromecastManager.delegate = self;
[self.chromecastManager connect];

連線裝置後，透過 Launch application 跟 Chromecast Device 進行溝通

[self.chromecastManager launchApplication:kGCKMediaDefaultReceiverApplicationID];

透過 - (void)deviceManager:(GCKDeviceManager *)deviceManager didConnectToCastApplication:(GCKApplicationMetadata *)applicationMetadata sessionID:(NSString *)sessionID launchedApplication:(BOOL)launchedApplication; 偵測完成 chromecast app 程式啟動並建立 GCKMediaControlChannel

self.mediaControlChannel = [[GCKMediaControlChannel alloc] init];
self.mediaControlChannel.delegate = self;
[deviceManager addChannel:self.mediaControlChannel];
[self.mediaControlChannel requestStatus];

播放 Resource，以 http://www.w3schools.com/html/mov_bbb.mp4 為例

NSMutableArray *tracks = [[NSMutableArray alloc] init];
GCKMediaMetadata *metadata = [[GCKMediaMetadata alloc] initWithMetadataType:GCKMediaMetadataTypeGeneric];
GCKMediaInformation *mi = [[GCKMediaInformation alloc] initWithContentID:@"http://www.w3schools.com/html/mov_bbb.mp4" streamType:GCKMediaStreamTypeNone contentType:nil metadata:metadata streamDuration:0 mediaTracks:tracks textTrackStyle:[GCKMediaTextTrackStyle createDefault] customData:nil];
[self.mediaControlChannel loadMedia:mi autoplay:YES];

如此一來 Chromecast device 就會播放指定的連結啦。

2014年8月10日星期日

iOS 開發筆記 - 透過 CocoaPods - FMDB / FMDatabase 管理 SQLite Databases

好久沒用 C/C++ 處理 SQLite 的操作，原本有意直接在 Objective-C 一樣寫 C 來處理，但想起來最近一直把玩 CocoaPods ，就搜尋一下，發現 FMDB 還滿多的推薦的，且 github.com/ccgus/fmdb 上頭也有很猛的人數 XD 就下海來使用 FMDB 啦！

主要看中 FMDB 的特色：提供 Data Sanitization 機制！就是寫 PHP 時，會透過 mysql_real_escape_string 來處理 raw data ，避免資料格式破壞 SQL 語法。

把玩筆記：


#import "FMDatabase.h"

// $ vim Podfile

// pod 'FMDB'



- (void)insert {

 // Documents/test.db

 NSString *dbPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"test.db"];

 BOOL needInitTable = ![[NSFileManager defaultManager] fileExistsAtPath:dbPath];

 FMDatabase *db = [FMDatabase databaseWithPath:dbPath];

 if ([db open]) {

  // init table

  if (needInitTable && ![db executeStatements:@"CREATE TABLE IF NOT EXISTS t (id VARCHAR(8), number INT)"]) {

   NSLog(@"table init error");

   return;

  }



  // insert data

  if (![db executeUpdate:@"INSERT OR IGNORE INTO t (id, number) VALUES ( :id, :number )" withParameterDictionary:@{

    @"id" : @"id_data",

    @"number": @(12345)

  }] ) {

   NSLog(@"insert error");

  }

  [db close];

 }

}



- (NSArray *)query {

 // Documents/test.db

 NSString *dbPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"test.db"];

 BOOL needInitTable = ![[NSFileManager defaultManager] fileExistsAtPath:dbPath];

 FMDatabase *db = [FMDatabase databaseWithPath:dbPath];

 if (!needInitTable) {

  if ([db open]) {

   NSMutableArray *output = [[NSMutableArray alloc] init];

   FMResultSet *rs = [db executeQuery:"SELECT id, number FROM test;"];

   while ([rs next]) {

    // records to NSArray

    NSMutableDictionary *item = [[NSMutableDictionary alloc] init];



    item[@"id"] = [rs stringForColumn:@"id"];

    item[@"number"] = @([rs intForColumn:@"number");



    [output addObject:item];

   }

   [db close];

   return output;

  }

 }

 return @[];

}

2014年7月23日星期三

iOS 開發筆記 - 使用 UITapGestureRecognizer / UISwipeGestureRecognizer 偵測 UIView Click/Tap/Swipe Event (手指點擊、滑動事件)

沒把玩過，趁颱風天筆記一下 :P

One Click (Single Tap)：


- (void)viewDidLoad {

 [super viewDidLoad];

 UITapGestureRecognizer *tapGestureRecognizer;

 tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];

 tapGestureRecognizer.numberOfTapsRequired = 1;

 [self.view addGestureRecognizer:tapGestureRecognizer];

}



- (void)singleTap:(UIGestureRecognizer *)recognizer {

 NSLog(@"singleTap: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));

}

Double Click (Double Tap)：


- (void)viewDidLoad {

 [super viewDidLoad];

 UITapGestureRecognizer *tapGestureRecognizer;

 tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];

 tapGestureRecognizer.numberOfTapsRequired = 2;

 [self.view addGestureRecognizer:tapGestureRecognizer];

}



- (void)doubleTap:(UIGestureRecognizer *)recognizer {

 NSLog(@"doubleTap: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));

}

Swipe Up：


- (void)viewDidLoad {

 [super viewDidLoad];

 UISwipeGestureRecognizer *swipeGestureRecognizer;

 swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeUp:)];

 swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionUp;

 [self.view addGestureRecognizer:swipeGestureRecognizer];

}



- (void)swipeUp:(UIGestureRecognizer *)recognizer {

 NSLog(@"swipeUp: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));

}

Swipe Down：


- (void)viewDidLoad {

 [super viewDidLoad];

 UISwipeGestureRecognizer *swipeGestureRecognizer;

 swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeDown:)];

 swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionDown;

 [self.view addGestureRecognizer:swipeGestureRecognizer];

}



- (void)swipeDown:(UIGestureRecognizer *)recognizer {

 NSLog(@"swipeDown: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));

}

Swipe Left：


- (void)viewDidLoad {

 [super viewDidLoad];

 UISwipeGestureRecognizer *swipeGestureRecognizer;

 swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeft:)];

 swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;

 [self.view addGestureRecognizer:swipeGestureRecognizer];

}



- (void)swipeLeft:(UIGestureRecognizer *)recognizer {

 NSLog(@"swipeLeft: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));

}

Swipe Right：


- (void)viewDidLoad {

 [super viewDidLoad];

 UISwipeGestureRecognizer *swipeGestureRecognizer;

 swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRight:)];

 swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionRight;

 [self.view addGestureRecognizer:swipeGestureRecognizer];

}



- (void)swipeRight:(UIGestureRecognizer *)recognizer {

 NSLog(@"swipeRight: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));

}

其他部分，大概是注意 UIView 跟 UIViewController 內定已經有把 events 接收處理的事項，例如 UIScrollView 就有捲動事件，假設 UIScrollView 只有提供左右捲動的功能，那就偵測不到 SwipeLeft 跟 SwipeRight ，但 SwipeUp 跟 SwipeDown 仍可以。而 Single Tap 跟 Double Tap 之間，基本上兩者存在時，點擊兩下的過程中，Single Tap Action 跟 Double Tap Action 都會被執行，並且 Single Tap Action 會先被執行。

2014年3月12日星期三

iOS 開發筆記 - NSData to HEX NSString

最近把玩 Apple Push Notification service 時，需要將 App 取得的 Device Token 轉成 HEX String 來使用。


- (NSString *)getHEX:(NSData *)data

{

    const unsigned char *dataBytes = [data bytes];

    NSMutableString *ret = [NSMutableString stringWithCapacity:[data length] * 2];

    for (int i=0; i<[data length]; ++i)

        [ret appendFormat:@"%02X", (NSUInteger)dataBytes[i]];

    return ret;



}

2014年3月11日星期二

iOS 開發筆記 - 使用 MD5

忽然發現，自己在 iOS 上沒有用過 MD5 耶，一定是太少寫程式了 Orz


#import <CommonCrypto/CommonDigest.h>



- (NSString *)md5:(NSString *)str

{

    const char *cStr = [str UTF8String];

    unsigned char result[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, strlen(cStr), result );

    return [NSString

            stringWithFormat: @"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",

            result[0], result[1],

            result[2], result[3],

            result[4], result[5],

            result[6], result[7],

            result[8], result[9],

            result[10], result[11],

            result[12], result[13],

            result[14], result[15]

            ];



}

驗證方式：


$ echo -n "string" | md5

參考資料：Calculate MD5 on iPhone

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2015年11月25日 星期三

iOS 開發筆記 - 把玩 Chromecast SDK 播放網路連結（圖片、影片）

2014年8月10日 星期日

iOS 開發筆記 - 透過 CocoaPods - FMDB / FMDatabase 管理 SQLite Databases

2014年7月23日 星期三