//
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// SDBrowserImageView.m
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// SDPhotoBrowser
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//
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// Created by aier on 15-2-6.
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// Copyright (c) 2015年 GSD. All rights reserved.
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//
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#import "SDBrowserImageView.h"
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#import "UIImageView+WebCache.h"
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#import "SDPhotoBrowserConfig.h"
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@implementation SDBrowserImageView
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{
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__weak SDWaitingView *_waitingView;
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BOOL _didCheckSize;
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UIScrollView *_scroll;
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UIImageView *_scrollImageView;
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UIScrollView *_zoomingScroolView;
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UIImageView *_zoomingImageView;
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CGFloat _totalScale;
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}
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- (id)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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self.userInteractionEnabled = YES;
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self.contentMode = UIViewContentModeScaleAspectFit;
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_totalScale = 1.0;
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// 捏合手势缩放图片
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UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(zoomImage:)];
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pinch.delegate = self;
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[self addGestureRecognizer:pinch];
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}
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return self;
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}
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- (BOOL)isScaled
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{
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return 1.0 != _totalScale;
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}
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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_waitingView.center = CGPointMake(self.frame.size.width * 0.5, self.frame.size.height * 0.5);
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CGSize imageSize = self.image.size;
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if (self.bounds.size.width * (imageSize.height / imageSize.width) > self.bounds.size.height) {
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if (!_scroll) {
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UIScrollView *scroll = [[UIScrollView alloc] init];
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scroll.backgroundColor = [UIColor whiteColor];
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UIImageView *imageView = [[UIImageView alloc] init];
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imageView.image = self.image;
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_scrollImageView = imageView;
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[scroll addSubview:imageView];
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scroll.backgroundColor = SDPhotoBrowserBackgrounColor;
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_scroll = scroll;
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[self addSubview:scroll];
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if (_waitingView) {
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[self bringSubviewToFront:_waitingView];
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}
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}
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_scroll.frame = self.bounds;
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CGFloat imageViewH = self.bounds.size.width * (imageSize.height / imageSize.width);
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_scrollImageView.bounds = CGRectMake(0, 0, _scroll.frame.size.width, imageViewH);
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_scrollImageView.center = CGPointMake(_scroll.frame.size.width * 0.5, _scrollImageView.frame.size.height * 0.5);
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_scroll.contentSize = CGSizeMake(0, _scrollImageView.bounds.size.height);
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} else {
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if (_scroll) [_scroll removeFromSuperview]; // 防止旋转时适配的scrollView的影响
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}
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}
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- (void)setProgress:(CGFloat)progress
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{
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_progress = progress;
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_waitingView.progress = progress;
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}
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- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder
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{
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SDWaitingView *waiting = [[SDWaitingView alloc] init];
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waiting.bounds = CGRectMake(0, 0, 100, 100);
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waiting.mode = SDWaitingViewProgressMode;
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_waitingView = waiting;
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[self addSubview:waiting];
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__weak SDBrowserImageView *imageViewWeak = self;
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[self sd_setImageWithURL:url placeholderImage:placeholder options:SDWebImageRetryFailed progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
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imageViewWeak.progress = (CGFloat)receivedSize / expectedSize;
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} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
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[imageViewWeak removeWaitingView];
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if (error) {
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UILabel *label = [[UILabel alloc] init];
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label.bounds = CGRectMake(0, 0, 160, 30);
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label.center = CGPointMake(imageViewWeak.bounds.size.width * 0.5, imageViewWeak.bounds.size.height * 0.5);
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label.text = @"图片加载失败";
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label.font = [UIFont systemFontOfSize:16];
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label.textColor = [UIColor whiteColor];
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label.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.8];
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label.layer.cornerRadius = 5;
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label.clipsToBounds = YES;
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label.textAlignment = NSTextAlignmentCenter;
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[imageViewWeak addSubview:label];
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} else {
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_scrollImageView.image = image;
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[_scrollImageView setNeedsDisplay];
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}
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}];
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}
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- (void)zoomImage:(UIPinchGestureRecognizer *)recognizer
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{
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[self prepareForImageViewScaling];
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CGFloat scale = recognizer.scale;
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CGFloat temp = _totalScale + (scale - 1);
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[self setTotalScale:temp];
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recognizer.scale = 1.0;
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}
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- (void)setTotalScale:(CGFloat)totalScale
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{
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if ((_totalScale < 0.5 && totalScale < _totalScale) || (_totalScale > 2.0 && totalScale > _totalScale)) return; // 最大缩放 2倍,最小0.5倍
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[self zoomWithScale:totalScale];
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}
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- (void)zoomWithScale:(CGFloat)scale
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{
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_totalScale = scale;
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_zoomingImageView.transform = CGAffineTransformMakeScale(scale, scale);
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if (scale > 1) {
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CGFloat contentW = _zoomingImageView.frame.size.width;
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CGFloat contentH = MAX(_zoomingImageView.frame.size.height, self.frame.size.height);
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_zoomingImageView.center = CGPointMake(contentW * 0.5, contentH * 0.5);
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_zoomingScroolView.contentSize = CGSizeMake(contentW, contentH);
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CGPoint offset = _zoomingScroolView.contentOffset;
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offset.x = (contentW - _zoomingScroolView.frame.size.width) * 0.5;
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// offset.y = (contentH - _zoomingImageView.frame.size.height) * 0.5;
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_zoomingScroolView.contentOffset = offset;
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} else {
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_zoomingScroolView.contentSize = _zoomingScroolView.frame.size;
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_zoomingScroolView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
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_zoomingImageView.center = _zoomingScroolView.center;
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}
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}
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- (void)doubleTapToZommWithScale:(CGFloat)scale
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{
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[self prepareForImageViewScaling];
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[UIView animateWithDuration:0.5 animations:^{
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[self zoomWithScale:scale];
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} completion:^(BOOL finished) {
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if (scale == 1) {
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[self clear];
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}
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}];
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}
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- (void)prepareForImageViewScaling
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{
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if (!_zoomingScroolView) {
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_zoomingScroolView = [[UIScrollView alloc] initWithFrame:self.bounds];
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_zoomingScroolView.backgroundColor = SDPhotoBrowserBackgrounColor;
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_zoomingScroolView.contentSize = self.bounds.size;
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UIImageView *zoomingImageView = [[UIImageView alloc] initWithImage:self.image];
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CGSize imageSize = zoomingImageView.image.size;
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CGFloat imageViewH = self.bounds.size.height;
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if (imageSize.width > 0) {
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imageViewH = self.bounds.size.width * (imageSize.height / imageSize.width);
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}
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zoomingImageView.bounds = CGRectMake(0, 0, self.bounds.size.width, imageViewH);
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zoomingImageView.center = _zoomingScroolView.center;
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zoomingImageView.contentMode = UIViewContentModeScaleAspectFit;
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_zoomingImageView = zoomingImageView;
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[_zoomingScroolView addSubview:zoomingImageView];
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[self addSubview:_zoomingScroolView];
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}
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}
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- (void)scaleImage:(CGFloat)scale
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{
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[self prepareForImageViewScaling];
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[self setTotalScale:scale];
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}
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// 清除缩放
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- (void)eliminateScale
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{
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[self clear];
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_totalScale = 1.0;
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}
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- (void)clear
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{
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[_zoomingScroolView removeFromSuperview];
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_zoomingScroolView = nil;
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_zoomingImageView = nil;
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}
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- (void)removeWaitingView
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{
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[_waitingView removeFromSuperview];
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}
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@end
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