NCFollowMeButton.m

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//
//  NCFollowMeButton.m
//  Follow Me button widget for navigation view
//
 
#import "NCFollowMeButton.h"
#import "NCFollowMeButtonConfig.h"
#import "NCWidgetStyles.h"
 
@interface NCFollowMeButton ()
@property (nonatomic, copy) NCFollowMeButtonCallback onPressed;
@property (nonatomic, strong) UIImageView *arrow;
@property (nonatomic, readwrite, getter=isFollowing) BOOL following;
@property (nonatomic, strong, nullable) NCFollowMeButtonConfig *config;
@end
 
@implementation NCFollowMeButton
 
- (instancetype)initWithOnPressed:(NCFollowMeButtonCallback)onPressed {
    return [self initWithOnPressed:onPressed config:nil];
}
 
- (instancetype)initWithOnPressed:(NCFollowMeButtonCallback)onPressed
                          config:(NCFollowMeButtonConfig *)config {
    self = [super initWithFrame:CGRectZero];
    if (self) {
        _onPressed = [onPressed copy];
        _following = NO;
        _config = config;
        [self setupUI];
    }
    return self;
}
 
- (void)setupUI {
    NCFollowMeButtonConfig *c = _config ?: [NCFollowMeButtonConfig defaultConfig];
    self.backgroundColor = c.buttonBackgroundColor ?: kNCButtonBackgroundColor();
    self.layer.cornerRadius = kNCBorderRadius;
    self.layer.masksToBounds = NO;
    self.layer.shadowOpacity = kNCShadowOpacity;
    self.layer.shadowRadius = kNCShadowRadius;
    self.layer.shadowOffset = kNCShadowOffset;
    self.layer.shadowColor = kNCShadowColor().CGColor;
 
    [self addTarget:self
             action:@selector(followMePressed:)
    forControlEvents:UIControlEventTouchUpInside];
 
    self.translatesAutoresizingMaskIntoConstraints = NO;
 
    UIImage *image = c.followMeIcon;
    if (!image) {
        NSBundle *bundle = [NSBundle bundleWithIdentifier:@"com.navigine"];
        image = [UIImage imageNamed:@"navigine_follow_me" inBundle:bundle withConfiguration:nil];
    }
    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
 
    self.arrow = [[UIImageView alloc] initWithImage:image];
    self.arrow.tintColor = c.textColor ?: kNCBaseBlackColor();
 
    self.arrow.translatesAutoresizingMaskIntoConstraints = NO;
    self.arrow.contentMode = UIViewContentModeScaleAspectFit;
 
    [self addSubview:self.arrow];
 
    CGFloat padding = 8.0f;
 
    [NSLayoutConstraint activateConstraints:@[
        [self.arrow.topAnchor      constraintEqualToAnchor:self.topAnchor      constant:padding],
        [self.arrow.leadingAnchor  constraintEqualToAnchor:self.leadingAnchor  constant:padding],
        [self.arrow.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-padding],
        [self.arrow.bottomAnchor   constraintEqualToAnchor:self.bottomAnchor   constant:-padding]
    ]];
 
    [self updateAppearanceForFollowingState:NO];
}
 
- (void)followMePressed:(UIButton *)sender {
    self.following = !self.isFollowing;
    [self updateAppearanceForFollowingState:self.following];
 
    if (self.onPressed) {
        self.onPressed(self.isFollowing);
    }
}
 
- (UIImage *)defaultFollowMeImage {
    NSBundle *bundle = [NSBundle bundleWithIdentifier:@"com.navigine"];
    return [UIImage imageNamed:@"navigine_follow_me" inBundle:bundle withConfiguration:nil];
}
 
- (void)applyConfig:(NCFollowMeButtonConfig *)config {
    _config = config;
    if (self.arrow) {
        [self updateAppearanceForFollowingState:self.isFollowing];
    }
}
 
- (void)updateAppearanceForFollowingState:(BOOL)isFollowing {
    self.following = isFollowing;
 
    NCFollowMeButtonConfig *c = _config ?: [NCFollowMeButtonConfig defaultConfig];
    UIImage *inactiveImg = c.followMeIcon ?: [self defaultFollowMeImage];
    UIImage *activeImg = c.followMeIconActive ?: c.followMeIcon ?: [self defaultFollowMeImage];
    self.arrow.image = [(isFollowing ? activeImg : inactiveImg) imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
 
    UIColor *accentColor = c.accentColor ?: kNCBaseBlueColor();
    UIColor *textColor = c.textColor ?: kNCBaseBlackColor();
    UIColor *bgColor = c.buttonBackgroundColor ?: kNCButtonBackgroundColor();
 
    [UIView animateWithDuration:kNCStandardAnimationDuration
                          delay:0
         usingSpringWithDamping:kNCSpringAnimationDamping
          initialSpringVelocity:kNCSpringAnimationInitialVelocity
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
        if (isFollowing) {
            self.arrow.tintColor = accentColor;
            self.layer.borderWidth = kNCActiveBorderWidth;
            self.layer.borderColor = kNCBorderColor().CGColor;
            self.backgroundColor = kNCWhiteBackgroundColor();
        } else {
            self.arrow.tintColor = textColor;
            self.layer.borderWidth = 0;
            self.backgroundColor = bgColor;
        }
    } completion:nil];
}
 
@end