//
//  PlaceholderImageView.h
//  SDWebImageViewPlaceHorder
//
//  Created by YouXianMing on 16/8/19.
//  Copyright © 2016年 YouXianMing. All rights reserved.
//

#import <UIKit/UIKit.h>@interface PlaceholderImageView : UIView/***  Picture's url string.*/
@property (nonatomic, strong) NSString *urlString;/***  The placeholder's image.*/
@property (nonatomic, strong) UIImage  *placeholderImage;/***  Default is UIViewContentModeScaleAspectFill.*/
@property (nonatomic) UIViewContentMode placeholderImageContentMode;/***  Default is UIViewContentModeScaleAspectFill.*/
@property (nonatomic) UIViewContentMode contentImageContentMode;/**PlaceholderImageView's constractor.@param frame The Frame.@param image The placeholderImage.@return The PlaceholderImageView's instancetype.*/
+ (instancetype)placeholderImageViewWithFrame:(CGRect)frame placeholderImage:(UIImage *)image;@end

//
//  PlaceholderImageView.m
//  SDWebImageViewPlaceHorder
//
//  Created by YouXianMing on 16/8/19.
//  Copyright © 2016年 YouXianMing. All rights reserved.
//

#import "PlaceholderImageView.h"
#import "UIImageView+WebCache.h"@interface PlaceholderImageView ()@property (nonatomic, strong) UIImageView *placeHoderImageView;
@property (nonatomic, strong) UIImageView *contentImageView;
@property (nonatomic, strong) NSString    *pUrlString;@end@implementation PlaceholderImageView- (void)layoutSubviews {[super layoutSubviews];self.placeHoderImageView.frame = self.bounds;self.contentImageView.frame    = self.bounds;
}- (instancetype)initWithFrame:(CGRect)frame {if (self = [super initWithFrame:frame]) {self.layer.masksToBounds = YES;self.placeHoderImageView = [[UIImageView alloc] initWithFrame:self.bounds];self.contentImageView    = [[UIImageView alloc] initWithFrame:self.bounds];[self addSubview:self.placeHoderImageView];[self addSubview:self.contentImageView];self.contentImageContentMode     = UIViewContentModeScaleAspectFill;self.placeholderImageContentMode = UIViewContentModeScaleAspectFill;}return self;
}+ (instancetype)placeholderImageViewWithFrame:(CGRect)frame placeholderImage:(UIImage *)image {PlaceholderImageView *placeHolderImageView = [[PlaceholderImageView alloc] initWithFrame:frame];placeHolderImageView.placeholderImage      = image;return placeHolderImageView;
}#pragma mark - Setter & Getter.- (void)setPlaceholderImage:(UIImage *)placeholderImage {_placeHoderImageView.image = placeholderImage;
}- (UIImage *)placeholderImage {return _placeHoderImageView.image;
}- (void)setUrlString:(NSString *)urlString {_pUrlString             = urlString;_contentImageView.alpha = 0.f;NSURL *url = [NSURL URLWithString:urlString];[_contentImageView sd_setImageWithURL:url completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {if (image) {// Image load from disk or download from network.if (cacheType == SDImageCacheTypeNone || cacheType == SDImageCacheTypeDisk) {[UIView animateWithDuration:0.5f animations:^{_contentImageView.alpha = 1.f;}];} else {_contentImageView.alpha = 1.f;}}}];
}- (NSString *)urlString {return _pUrlString;
}- (void)setPlaceholderImageContentMode:(UIViewContentMode)placeholderImageContentMode {_placeHoderImageView.contentMode = placeholderImageContentMode;
}- (UIViewContentMode)placeholderImageContentMode {return _placeHoderImageView.contentMode;
}- (void)setContentImageContentMode:(UIViewContentMode)contentImageContentMode {_contentImageView.contentMode = contentImageContentMode;
}- (UIViewContentMode)contentImageContentMode {return _contentImageView.contentMode;
}@end