Галайко Никита Геннадьевич

Блог Галайко Никиты

Category Archives: Языки

Go Open-source!

Posted on by Posted in Delphi, Open source, Общая Leave a comment

Наконец-то дошли руки!
Уже давно хотелось поделиться своими экспериментами юности в области программирования.
В основном тогда мне было интересно писать на Pascal/Delphi + Assembler.

Пользуйтесь на здоровье в образовательных целях! =)

О пользе рефакторинга

Posted on by Posted in Objective-C Leave a comment

Вот простой пример (из моего реального проекта), как можно рефакторить код и сделать его короче и читаемым:
Сначала получилась как обычно ужасная куча нечитаемого кода:

        NSString *name = [[filename pathComponents] lastObject];
        NSString *ext = [name pathExtension];
        NSString *iconImg = [NSString stringWithFormat:@"icon%@",[ext uppercaseString]];
        if (!iconImg) iconImg = @"iconUnknown";
        if (([ext caseInsensitiveCompare:@"html"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"htm"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"xml"] == NSOrderedSame))
            iconImg = @"iconWeb";
        else if (([ext caseInsensitiveCompare:@"mp3"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"m4a"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"wav"] == NSOrderedSame))
                iconImg = @"iconAudio";
        else if (([ext caseInsensitiveCompare:@"mp4"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"mpeg"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"qt"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"avi"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"m4v"] == NSOrderedSame))
            iconImg = @"iconVideo";
        else if (([ext caseInsensitiveCompare:@"mp3"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"m4a"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"wav"] == NSOrderedSame))
            iconImg = @"iconAudio";
        else if (([ext caseInsensitiveCompare:@"jpg"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"jpeg"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"gif"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"tiff"] == NSOrderedSame)||([ext caseInsensitiveCompare:@"tiff"] == NSOrderedSame))
            iconImg = @"iconGraphic";
        else if (([ext caseInsensitiveCompare:@"xlsx"] == NSOrderedSame))
            iconImg = @"iconXLS";
        else if (([ext caseInsensitiveCompare:@"docx"] == NSOrderedSame))
            iconImg = @"iconDOC";
        else if (([ext caseInsensitiveCompare:@"pptx"] == NSOrderedSame))
            iconImg = @"iconPPT";
        
        _icon = [UIImage imageNamed:iconImg];

Пришлось написать довесок к классу NSString:

@interface NSString (Adds)
- (BOOL)caseInsensitiveExistsInArray:(NSArray *)a;
@end

@implementation NSString (Adds)

- (BOOL)caseInsensitiveExistsInArray:(NSArray *)a
{
    BOOL exist = NO;
    for (NSString *s in a) {
        if ([self caseInsensitiveCompare:s] == NSOrderedSame)
        {
            exist = YES;
            break;
        }
    }
    return exist;
}

@end

На выходе теперь стало вот так:

NSString *name = [[filename pathComponents] lastObject];
        NSString *ext = [name pathExtension];
        NSString *iconImg = [NSString stringWithFormat:@"icon%@",[ext uppercaseString]];
        if (!iconImg) iconImg = @"iconUnknown";
        if ([ext caseInsensitiveExistsInArray:@[@"html",@"htm",@"xml"]])
            iconImg = @"iconWeb";
        else if ([ext caseInsensitiveExistsInArray:@[@"mp3",@"m4a",@"wav"]])
            iconImg = @"iconAudio";
        else if ([ext caseInsensitiveExistsInArray:@[@"mp4",@"mpeg",@"mpg",@"qt"]])
            iconImg = @"iconVideo";
        else if ([ext caseInsensitiveExistsInArray:@[@"jpg",@"jpeg",@"gif",@"tiff"]])
            iconImg = @"iconGraphic";
        else if ([ext caseInsensitiveExistsInArray:@[@"xlsx"]])
            iconImg = @"iconXLS";
        else if ([ext caseInsensitiveExistsInArray:@[@"docx"]])
            iconImg = @"iconDOC";
        else if ([ext caseInsensitiveExistsInArray:@[@"pptx"]])
            iconImg = @"iconPPT";
        
        _icon = [UIImage imageNamed:iconImg];

По моему, результат на лицо — код стал намного понятнее и удобнее наращивать…

CGContext — инверсия цвета

Posted on by Posted in iOS, Objective-C Leave a comment 
UIGraphicsBeginImageContext(image.size);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeDifference);
CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(),[UIColor whiteColor].CGColor);
CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, image.size.width, image.size.height));
UIImage *returnImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIBarButtonItem

Posted on by Posted in iOS, Objective-C Leave a comment

Кнопка в тулбаре/навбаре с красивой иконкой.

    UIImage *faceImage = [UIImage imageNamed:(screenLocked) ? @"Locked" : @"Unlocked"];
    UIButton *lockBt = [UIButton buttonWithType:UIButtonTypeCustom];
    lockBt.bounds = CGRectMake(0, 0, faceImage.size.width, faceImage.size.height);
    [lockBt setImage:faceImage forState:UIControlStateNormal];
    [lockBt addTarget:self action:@selector(lockScreen:) forControlEvents:UIControlEventTouchUpInside];
    lockButton = [[UIBarButtonItem alloc] initWithCustomView:lockBt];

Спрятать UITabBar программно

Posted on by Posted in iOS, Objective-C Leave a comment 
#import "UITabBarController+ShowHideBar.h"

@implementation UITabBarController (ShowHideBar)

- (void) setHidden:(BOOL)hidden{

    CGRect screenRect = [[UIScreen mainScreen] bounds];
    float fHeight = screenRect.size.height;
    if(  UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) ){
        fHeight = screenRect.size.width;
    }

    if(!hidden) fHeight -= self.tabBar.frame.size.height;

    [UIView animateWithDuration:0.25 animations:^{
        for(UIView *view in self.view.subviews){
            if([view isKindOfClass:[UITabBar class]]){
                [view setFrame:CGRectMake(view.frame.origin.x, fHeight, view.frame.size.width, view.frame.size.height)];
            }else{
                if(hidden) [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];
            }
        }
    }completion:^(BOOL finished){
        if(!hidden){

            [UIView animateWithDuration:0.25 animations:^{

                for(UIView *view in self.view.subviews)
                {
                    if(![view isKindOfClass:[UITabBar class]])
                        [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];
                }

            }];
        }
    }];

}

@end

Отправка СМС через приложение

Posted on by Posted in iOS, Objective-C Leave a comment 
if ( [[[UIDevice currentDevice] systemVersion] doubleValue ] >= 4.0 )
    {
        MFMessageComposeViewController *controller = [[MFMessageComposeViewController alloc] init];
        if([MFMessageComposeViewController canSendText])
        {
            controller.body = str;
            controller.recipients = nil;
            controller.messageComposeDelegate = self;
            [self presentViewController:controller animated:YES completion:nil];
        }
    }