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[操作系统]PlaceholderImageView


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 <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;@end

ImageCell.h/.m
//// ImageCell.h// SDWebImageViewPlaceHorder//// Created by YouXianMing on 16/9/14.// Copyright © 2016年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>#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 () <UITableViewDelegate, UITableViewDataSource>@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