PlaceholderImageView

 

说明

1. PlaceHolderImageView基于SDWebImage编写

2. 给定一个图片的urlString,以及一个placeholderImage就可以优雅的显示图片加载效果

 

效果

 

源码

PlaceholderImageView.h/.m

////  PlaceholderImageView.h//  SDWebImageViewPlaceHorder////  Created by YouXianMing on 16/9/14.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import 
     
      @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;@end
     

ImageCell.h/.m

////  ImageCell.h//  SDWebImageViewPlaceHorder////  Created by YouXianMing on 16/9/14.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import 
     
      #import "PlaceholderImageView.h"@interface ImageCell : UITableViewCell@property (nonatomic, strong) PlaceholderImageView  *placeholderImageView;@end
     

////  ImageCell.m//  SDWebImageViewPlaceHorder////  Created by YouXianMing on 16/9/14.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "ImageCell.h"@implementation ImageCell- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {                self.selectionStyle = UITableViewCellSelectionStyleNone;                self.placeholderImageView                  = [[PlaceholderImageView alloc] initWithFrame:CGRectMake(0, 0, 150.f, 150.f)];        self.placeholderImageView.placeholderImage = [UIImage imageNamed:@"1"];        [self addSubview:self.placeholderImageView];    }        return self;}@end

ViewController.m

////  ViewController.m//  SDWebImageViewPlaceHorder////  Created by YouXianMing on 16/9/14.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "UIImageView+WebCache.h"#import "PlaceholderImageView.h"#import "ImageCell.h"@interface ViewController () 
     
      @property (nonatomic, strong) UITableView  *tableView;@property (nonatomic, strong) NSArray      *pictures;@end@implementation ViewController- (void)viewDidLoad {        [super viewDidLoad];        self.pictures = @[@"https://pic.cnblogs.com/avatar/607542/20151017230728.png",                      @"https://pic.cnblogs.com/face/607741/20140226202001.png",                      @"https://pic.cnblogs.com/face/815231/20150923160245.png",                      @"https://pic.cnblogs.com/face/993558/20160729092113.png",                      @"https://pic.cnblogs.com/face/894202/20160217151952.png",                      @"https://pic.cnblogs.com/face/968459/20160709111712.png",                      @"https://pic.cnblogs.com/face/145865/20160210174306.png",                      @"https://pic.cnblogs.com/face/796658/20151026090914.png",                      @"https://pic.cnblogs.com/face/933887/20160629214007.png",                      @"https://pic.cnblogs.com/face/125303/20130313094252.png",                      @"https://pic.cnblogs.com/face/976232/20160730173456.png",                      @"https://pic.cnblogs.com/face/969708/20160602120239.png",                      @"https://pic.cnblogs.com/face/954541/20160705113740.png",                      @"https://pic.cnblogs.com/face/799942/20150818204115.png"];        PlaceholderImageView *pImageView = [[PlaceholderImageView alloc] initWithFrame:CGRectMake(0, 0, 150.f, 150.f)];    [self.view addSubview:pImageView];    pImageView.urlString = @"https://pic.cnblogs.com/avatar/607542/20151017230728.png";        self.tableView            = [[UITableView alloc] initWithFrame:self.view.bounds];    self.tableView.delegate   = self;    self.tableView.dataSource = self;    self.tableView.rowHeight  = 150.f;    [self.view addSubview:self.tableView];        [self.tableView registerClass:[ImageCell class] forCellReuseIdentifier:@"ImageCell"];}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return _pictures.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    ImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ImageCell"];    cell.placeholderImageView.urlString = _pictures[indexPath.row];        return cell;}@end