Telegram/Telegraph/TGChannelIntroController.m

#import "TGChannelIntroController.h"
#import "TGFont.h"
#import "TGModernButton.h"

#import "TGImageUtils.h"

#import "TGCreateGroupController.h"

@interface TGChannelIntroController ()
{
    TGModernButton *_backButton;
    UIImageView *_phoneImageView;
    UILabel *_titleLabel;
    UILabel *_descriptionLabel;
    TGModernButton *_createButton;
}
@end

@implementation TGChannelIntroController

- (void)loadView
{
    [super loadView];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    static dispatch_once_t onceToken;
    static UIImage *arrowImage = nil;
    dispatch_once(&onceToken, ^
    {
        UIImage *image = [UIImage imageNamed:@"NavigationBackArrow"];
        UIGraphicsBeginImageContextWithOptions(image.size, false, 0.0f);
        CGContextRef context = UIGraphicsGetCurrentContext();
        [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
        CGContextSetBlendMode (context, kCGBlendModeSourceAtop);
        CGContextSetFillColorWithColor(context, TGAccentColor().CGColor);
        CGContextFillRect(context, CGRectMake(0, 0, image.size.width, image.size.height));
        
        arrowImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    });
    
    _backButton = [[TGModernButton alloc] initWithFrame:CGRectZero];
    _backButton.exclusiveTouch = true;
    _backButton.titleLabel.font = TGSystemFontOfSize(17);
    [_backButton setTitle:TGLocalized(@"Common.Back") forState:UIControlStateNormal];
    [_backButton setTitleColor:TGAccentColor()];
    [_backButton addTarget:self action:@selector(backButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_backButton];
    
    UIImageView *arrowView = [[UIImageView alloc] initWithFrame:CGRectMake(-19, 5.5f, 13, 22)];
    arrowView.image = arrowImage;
    [_backButton addSubview:arrowView];
    
    _phoneImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ChannelIntro"]];
    _phoneImageView.frame = CGRectMake(0, 0, 154, 220);
    [self.view addSubview:_phoneImageView];
    
    _titleLabel = [[UILabel alloc] init];
    _titleLabel.backgroundColor = [UIColor clearColor];
    _titleLabel.font = TGSystemFontOfSize(21);
    _titleLabel.textColor = [UIColor blackColor];
    _titleLabel.textAlignment = NSTextAlignmentCenter;
    _titleLabel.text = TGLocalized(@"ChannelIntro.Title");
    [self.view addSubview:_titleLabel];
    
    _descriptionLabel = [[UILabel alloc] init];
    _descriptionLabel.backgroundColor = [UIColor clearColor];
    _descriptionLabel.numberOfLines = 0;
    _descriptionLabel.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:_descriptionLabel];
    
    NSString *description = TGLocalized(@"ChannelIntro.Text");
    NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:description];
    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    style.lineSpacing = 2;
    style.alignment = NSTextAlignmentCenter;
    [attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, description.length)];
    [attrString addAttribute:NSForegroundColorAttributeName value:UIColorRGB(0x8e8e93) range:NSMakeRange(0, description.length)];
    [attrString addAttribute:NSFontAttributeName value:TGSystemFontOfSize(16) range:NSMakeRange(0, description.length)];
    _descriptionLabel.attributedText = attrString;
    
    _createButton = [[TGModernButton alloc] init];
    _createButton.exclusiveTouch = true;
    _createButton.backgroundColor = [UIColor clearColor];
    _createButton.titleLabel.font = TGSystemFontOfSize(21);
    [_createButton setTitleColor:TGAccentColor()];
    [_createButton setTitle:TGLocalized(@"ChannelIntro.CreateChannel") forState:UIControlStateNormal];
    [_createButton addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_createButton];
}

- (bool)navigationBarShouldBeHidden
{
    return true;
}

- (void)backButtonPressed
{
    [self.navigationController popViewControllerAnimated:true];
}

- (void)buttonPressed
{
    TGCreateGroupController *controller = [[TGCreateGroupController alloc] initWithCreateChannel:true createChannelGroup:false];
    [self.navigationController pushViewController:controller animated:true];
    
    [[NSUserDefaults standardUserDefaults] setObject:@true forKey:@"didShowChannelIntro_v1"];
}

- (void)viewWillLayoutSubviews
{
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    
    [_backButton sizeToFit];
    _backButton.frame = CGRectMake(27, 25.5f, ceil(_backButton.frame.size.width), ceil(_backButton.frame.size.height));
    
    [_titleLabel sizeToFit];
    [_descriptionLabel sizeToFit];
    [_createButton sizeToFit];
    
    int screenSize = (int)TGScreenSize().height;
    CGFloat titleY = 0;
    CGFloat imageY = 0;
    CGFloat descY = 0;
    CGFloat buttonY = 0;
        
    if (UIInterfaceOrientationIsPortrait(orientation))
    {
        switch (screenSize)
        {
            case 736:
                titleY = 445;
                imageY = 141;
                descY = 490;
                buttonY = 610;
                break;
                
            case 667:
                titleY = 407;
                imageY = 120;
                descY = 448;
                buttonY = 558;
                break;
                
            case 568:
                titleY = 354;
                imageY = 87;
                descY = 397;
                buttonY = 496;
                break;
                
            default:
                titleY = 307;
                imageY = 60;
                descY = 344;
                buttonY = 424;
                break;
        }
       
        _phoneImageView.frame = CGRectMake((self.view.frame.size.width - _phoneImageView.frame.size.width) / 2, imageY, _phoneImageView.frame.size.width, _phoneImageView.frame.size.height);
        _titleLabel.frame = CGRectMake((self.view.frame.size.width - _titleLabel.frame.size.width) / 2, titleY, ceil(_titleLabel.frame.size.width), ceil(_titleLabel.frame.size.height));
        _descriptionLabel.frame = CGRectMake((self.view.frame.size.width - _descriptionLabel.frame.size.width) / 2, descY, ceil(_descriptionLabel.frame.size.width), ceil(_descriptionLabel.frame.size.height));

        _createButton.frame = CGRectMake((self.view.frame.size.width - _createButton.frame.size.width) / 2, buttonY, ceil(_createButton.frame.size.width), ceil(_createButton.frame.size.height));
    }
    else
    {
        CGFloat leftX = 0;
        CGFloat rightX = 0;
        
        switch (screenSize)
        {
            case 736:
                leftX = 209;
                rightX = 504;
                titleY = 115;
                descY = 156;
                buttonY = 278;
                break;
                
            case 667:
                leftX = 190;
                rightX = 448;
                titleY = 103;
                descY = 148;
                buttonY = 237;
                break;
                
            case 568:
                leftX = 164;
                rightX = 388;
                titleY = 78;
                descY = 121;
                buttonY = 217;
                break;
                
            default:
                leftX = 125;
                rightX = 328;
                titleY = 78;
                descY = 121;
                buttonY = 219;
                break;
        }
        
        _phoneImageView.frame = CGRectMake(leftX - _phoneImageView.frame.size.width / 2, (self.view.frame.size.height - _phoneImageView.frame.size.height) / 2, _phoneImageView.frame.size.width, _phoneImageView.frame.size.height);

        _titleLabel.frame = CGRectMake(rightX - _titleLabel.frame.size.width / 2, titleY, ceil(_titleLabel.frame.size.width), ceil(_titleLabel.frame.size.height));
        
        _descriptionLabel.frame = CGRectMake(rightX - _descriptionLabel.frame.size.width / 2, descY, ceil(_descriptionLabel.frame.size.width), ceil(_descriptionLabel.frame.size.height));
        
        _createButton.frame = CGRectMake(rightX - _createButton.frame.size.width / 2, buttonY, ceil(_createButton.frame.size.width), ceil(_createButton.frame.size.height));
    }
}

@end