加载网络图片圆形进度条(利用SDWebImage)

背景：

最近项目需要加载网络图片的时候显示圆形进度，提高用户体验，研究了一下做个记录。


progrss.png

思路

实现起来其实很简单。
1、创建UIImageView的分类，设置时直接调用分类方法。
2、借助SDWebImage的方法，拿到加载进度。

- (void)sd_setImageWithURL:(nullable NSURL *)url
          placeholderImage:(nullable UIImage *)placeholder
                   options:(SDWebImageOptions)options
                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
                 completed:(nullable SDExternalCompletionBlock)completedBlock;

3、自定义进度视图，绘制进度。

源码

UIImageView分类

#import "UIImageView+WebCache.h"
#import <SDWebImage/UIImageView+WebCache.h>
#import "CustomProgressView.h"

@interface UIImageView (ProgressView)

- (void)sd_setImageWithURL:(NSURL *)url usingProgressView:(CustomProgressView *)progressView;

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder usingProgressView:(CustomProgressView *)progressView;

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options usingProgressView:(CustomProgressView *)progressView;

- (void)sd_setImageWithURL:(NSURL *)url completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView;

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView;

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView;

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options progress:(SDWebImageDownloaderProgressBlock)progressBlock completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView;

- (void)removeProgressView;

@end

#import "UIImageView+ProgressView.h"


#define TAG_PROGRESS_VIEW 149462

@implementation UIImageView (ProgressView)

- (void)addProgressView:(CustomProgressView *)progressView {
    CustomProgressView *existingProgressView = (CustomProgressView *)[self viewWithTag:TAG_PROGRESS_VIEW];
    if (!existingProgressView) {
        if (!progressView) {
            progressView = [[CustomProgressView alloc] initWithFrame:self.frame];
            progressView.backgroundColor = [UIColor grayColor];
        }

        progressView.tag = TAG_PROGRESS_VIEW;
        progressView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin;

        float width = progressView.frame.size.width;
        float height = progressView.frame.size.height;
        float x = (self.frame.size.width / 2.0) - width/2;
        float y = (self.frame.size.height / 2.0) - height/2;
        progressView.frame = CGRectMake(x, y, width, height);

        [self addSubview:progressView];
    }
}

- (void)updateProgress:(CGFloat)progress {
    CustomProgressView *progressView = (CustomProgressView *)[self viewWithTag:TAG_PROGRESS_VIEW];
    if (progressView) {
        progressView.progressValue = progress;
    }
}

- (void)removeProgressView {
    CustomProgressView *progressView = (CustomProgressView *)[self viewWithTag:TAG_PROGRESS_VIEW];
    if (progressView) {
        [progressView removeFromSuperview];
    }
}

- (void)sd_setImageWithURL:(NSURL *)url usingProgressView:(CustomProgressView *)progressView {
    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil usingProgressView:progressView];
}

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder usingProgressView:(CustomProgressView *)progressView {
    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil usingProgressView:progressView];
}

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options usingProgressView:(CustomProgressView *)progressView{
    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil usingProgressView:progressView];
}

- (void)sd_setImageWithURL:(NSURL *)url completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView {
    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock usingProgressView:progressView];
}

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView {
    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock usingProgressView:progressView];
}

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView {
    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock usingProgressView:progressView];
}

- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options progress:(SDWebImageDownloaderProgressBlock)progressBlock completed:(SDExternalCompletionBlock)completedBlock usingProgressView:(CustomProgressView *)progressView {
    [self addProgressView:progressView];
    
    __weak typeof(self) weakSelf = self;

    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
        
        CGFloat progress = ((CGFloat)receivedSize / (CGFloat)expectedSize);
        dispatch_async(dispatch_get_main_queue(), ^{
            [weakSelf updateProgress:progress];
        });
        
        if (progressBlock) {
            progressBlock(receivedSize, expectedSize, url);
        }
        
    } completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
        
        [weakSelf removeProgressView];
        if (completedBlock) {
            completedBlock(image, error, cacheType, imageURL);
        }
        
    }];
    
}

@end

进度条视图

#import <UIKit/UIKit.h>

@interface CustomProgressView : UIView

@property (nonatomic, assign) CGFloat progressValue;

@end

#import "CustomProgressView.h"

@interface CustomProgressView ()

@property (nonatomic, strong) UILabel* progressLabel;

@end
@implementation CustomProgressView

- (instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        
    }
    return self;
}
-(UILabel *)progressLabel {
    if (!_progressLabel) {
        _progressLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 60, 60)];
        [self addSubview:_progressLabel];
    }
    return _progressLabel;
}

-(void)layoutSubviews {
    self.progressLabel.center = self.center;
}

- (void)setProgressValue:(CGFloat)progressValue
{
    _progressValue = progressValue;
    
    // 设置label的文字
    self.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", progressValue * 100];
    NSLog(@"self.progressLabel - %f",progressValue);
    
    // 重绘
    [self setNeedsDisplay];
}

-(void)drawRect:(CGRect)rect {
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:self.center radius:self.frame.size.width < self.frame.size.height ? self.frame.size.width * 0.3 : self.frame.size.height * 0.3 startAngle:-M_PI_2 endAngle:2 * M_PI * self.progressValue - M_PI_2 clockwise:1];
    
    [path setLineWidth:5];
    [[UIColor orangeColor] setStroke];
    // 填充
    [path stroke];
}

@end

调用方法

[self.imageView sd_setImageWithURL:[NSURL URLWithString:@"http://static1.beesns.cn/user/avatar/20190812/568deb487b8f5575b19a056e501d7533.jpg"] placeholderImage:nil options:SDWebImageCacheMemoryOnly usingProgressView:nil];

补充

画进度的时候根据进度绘制，调用[self setNeedsDisplay];会自动调用
-(void)drawRect:(CGRect)rect；

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