nishabe

dispatch_queue_t serialQueue = dispatch_queue_create(""imagesQueue"", DISPATCH_QUEUE_SERIAL);
dispatch_async(serialQueue, ^{
            // Perform long running process
            dispatch_async(dispatch_get_main_queue(), ^{
                // Update the UI
            });
        });"

nishabe

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
            // Perform long running process
 dispatch_async(dispatch_get_main_queue(), ^{
                // Update the UI
            });
        });"

nishabe

- (instancetype)init {
    self = [super init];
    if (self) {
        // perform initialization
    }
    return self;
}

nishabe

    NSDate to NSString:
    
    NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSDate* myDate = [NSDate date];
    NSString *stringFromDate = [dateFormatter stringFromDate:myDate];
    
    NSString to NSDate:
    
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

nishabe

#import "GCDWebServer.h"
#import "GCDWebServerDataResponse.h"
..........
@interface AppDelegate (){
    GCDWebServer* _webServer;
}

- (void)startWebServer{
    
    NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];

nishabe

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.log",stringFromDate]];

nishabe

NSLog(@"%s",__PRETTY_FUNCTION__);

nishabe

- (NSString*)readString{
    NSURL *filePath = [[NSBundle mainBundle] URLForResource:@"info" withExtension:@"txt"];
    NSString *path = [filePath path];
    NSString *content = @"";
    if([[NSFileManager defaultManager] fileExistsAtPath:path]) {
        // Do something here
        content = [NSString stringWithContentsOfFile:path
                                                      encoding:NSUTF8StringEncoding
                                                         error:NULL];
    }

nishabe

-(NSString*)generateHMACwith :(NSString* )key :(NSString*)data{
    const char *cKey  = [key cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cData = [data cStringUsingEncoding:NSUTF8StringEncoding];
    unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgSHA256,
           cKey,
           strlen(cKey),
           cData,
           strlen(cData),
           cHMAC);

nishabe

- (NSData *)generateHMACwith:(NSData *)key key:(NSData *)data {
    NSMutableData *macOut = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
    CCHmac( kCCHmacAlgSHA256,
           key.bytes,
           key.length,
           data.bytes,
           data.length,
           macOut.mutableBytes);
    return macOut;
}