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
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//// 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
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//// 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"
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@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
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//// 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 |
以上所述是小编给大家介绍的ios程序开发之使用placeholderimageview实现优雅的图片加载效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
