cam/CoreAssetImageView.m at master · SciApps/cam · GitHub

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//
//  MCKImageView.m
//  CoreAssetManager
//
//  Created by mrnuku on 2016. 01. 17..
//  Copyright © 2016. mrnuku. All rights reserved.
//

#import "CoreAssetImageView.h"

#if !TARGET_INTERFACE_BUILDER
#import "CoreAssetManager.h"
#import "CoreAssetItemImage.h"
#endif

#define ANIMATION_TRIGGER_TIME 0.01
#define ANIMATION_DURATION 0.3333

@implementation CoreAssetImageView {
    id cmBlock;
    BOOL signedToCommunicationManagerEvents;
}

#pragma mark - initializer methods

#if TARGET_INTERFACE_BUILDER
- (void)prepareForInterfaceBuilder {
    [self commonInit];
}
#endif

- (instancetype)init {
    self = [super init];

    if (self) {
        [self commonInit];
    }

    return self;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];

    if (self) {
        [self commonInit];
    }

    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];

    if (self) {
        [self commonInit];
    }

    return self;
}

- (instancetype)initWithImage:(UIImage *)image {
    self = [super initWithImage:image];

    if (self) {
        [self commonInit];
    }

    return self;
}

- (instancetype)initWithImage:(UIImage *)image highlightedImage:(UIImage *)highlightedImage {
    self = [super initWithImage:image highlightedImage:highlightedImage];

    if (self) {
        [self commonInit];
    }

    return self;
}

- (void)dealloc {
    if (signedToCommunicationManagerEvents) {
        signedToCommunicationManagerEvents = NO;
    }
}

- (void)commonInit {
    self.circleShaped = _circleShaped;
}

+ (Class)parentCamItemClass {
    return CoreAssetItemImage.class;
}

#pragma mark - logic

- (void)layoutSubviews {
    [super layoutSubviews];
    self.circleShaped = _circleShaped;
}

- (void)setCircleShaped:(BOOL)circleShaped {
    self.layer.cornerRadius = circleShaped ? self.bounds.size.width * .5 : 0;
    self.layer.masksToBounds = YES;

    _circleShaped = circleShaped;
}

- (void)setAssetName:(NSString *)assetName {
    if (![assetName isEqual:_assetName] && (!_assetName || [_assetName isKindOfClass:NSString.class])) {
        self.image = _emptyImage;

#if !TARGET_INTERFACE_BUILDER
        CFTimeInterval startTime = CACurrentMediaTime();
        NSUInteger assetNameLength = ((NSString *)_assetName).length;

        cmBlock = assetName.length ? [self.class.parentCamItemClass fetchAssetWithName:assetName withCompletionHandler:^(UIImage * _Nonnull assetData) {
            UIImage *oldImage = self.image;
            self.image = assetData;

            CFTimeInterval downloadTime = CACurrentMediaTime() - startTime;

            if (!assetNameLength || downloadTime >= ANIMATION_TRIGGER_TIME) {

                [CATransaction begin];
                if (oldImage) {
                    CABasicAnimation *crossFade = [CABasicAnimation animationWithKeyPath:@"contents"];
                    crossFade.duration = ANIMATION_DURATION;
                    crossFade.fromValue = (__bridge id _Nullable)(oldImage.CGImage);
                    crossFade.toValue = (__bridge id _Nullable)(assetData.CGImage);
                    [self.layer addAnimation:crossFade forKey:@"animateContents"];
                }
                else {
                    CATransition *transition = [CATransition animation];
                    transition.duration = ANIMATION_DURATION;
                    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
                    transition.type = kCATransitionFade;

                    [self.layer addAnimation:transition forKey:nil];
                }
                [CATransaction commit];
            }
        }] : nil;
#endif

        _assetName = assetName;
    }
}

- (void)resetToEmptyImage {
    self.image = _emptyImage;
    cmBlock = nil;
    _assetName = nil;
}

- (void)reloadAssetNameFromParent {
    if ([_parentRecord respondsToSelector:@selector(assetNameForUserData:)]) {
        self.assetName = [_parentRecord assetNameForUserData:_userData];
    }
}

@end