效果展示
·
进入构建结构
首先我们新建一个工程
接下来我们拖进来一个Table View Controller，将Storyboard Entry Point指向我们的Table View Controller。原来的ViewController就可以删除了。效果如图所示
选中Table View Controller，点击上面菜单栏中Editor->Embed in->Navigation Controller
基本的工作我们都做完了，可以讲工程中没用的东西都可以删除了，方便我们进行编写东西
主题（代码编写）
在这里我进行代码的编写，讲述主要部分，后面会把完整的项目给出
构建LDEntity用来初始化字典，进行Json数据的解析
LDEntity.h
#import <Foundation/Foundation.h>
@interface FDFeedEntity : NSObject
- (instancetype)initWithDictionary:(NSDictionary *)dictionary;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *content;
@property (nonatomic, copy) NSString *username;
@property (nonatomic, copy) NSString *time;
@property (nonatomic, copy) NSString *imageName;
@end
-(instancetype)initWithDictionary:(NSDictionary *)dictionary方法的具体实现，返回本身类型
LDEntity.m
#import "FDFeedEntity.h"
@implementation FDFeedEntity
- (instancetype)initWithDictionary:(NSDictionary *)dictionary
{
self = super.init;
if (self) {
self.title = dictionary[@"title"];
self.content = dictionary[@"content"];
self.username = dictionary[@"username"];
self.time = dictionary[@"time"];
self.imageName = dictionary[@"imageName"];
}
return self;
}
@end
以上代码的功能主要是为了解析JSON数据
构建我们的Main.storyboard
选中Table View更改Style为Grouped
设计出以下样式，并且使用 auto layout进行约束
接下来编写cell
新建LDCell 继承 UITableViewCell
将Main.storyboard中TableView中的Cell的Identifier设置为LDCell，并且关联LDCell
LDCell.h
构建一个LDEntity对象解析数据
#import <UIKit/UIKit.h>
#import "LDEntity.h"
@interface LDCell : UITableViewCell
@property(nonatomic,strong)LDEntity *entity;
@end
将刚才的所有控件与LDCell.m关联
在LDCell.m中构建entity的set方法,还有需要注意的是如果你没有使用auto layout,你需要重写约束方法
LDCell.m
#import "LDCell.h"
@interface LDCell ()
@property (weak, nonatomic) IBOutlet UILabel *titleLabel;
@property (weak, nonatomic) IBOutlet UILabel *contentLabel;
@property (weak, nonatomic) IBOutlet UIImageView *contentImageView;
@property (weak, nonatomic) IBOutlet UILabel *usernameLabel;
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;
@end
@implementation LDCell
- (void)awakeFromNib {
// 修复IOS7中的BUG- 初始化 constraints warning
self.contentView.bounds = [UIScreen mainScreen].bounds;
}
//关联控件进行数据显示
-(void)setEntity:(LDEntity *)entity{
_entity = entity;
self.titleLabel.text = entity.title;
self.contentLabel.text = entity.content;
self.contentImageView.image = entity.imageName.length > 0 ? [UIImage imageNamed:entity.imageName] : nil;
self.usernameLabel.text = entity.username;
self.timeLabel.text = entity.time;
}
#if 0
// 如果没有使用 auto layout, 请重写这个方法
- (CGSize)sizeThatFits:(CGSize)size
{
CGFloat totalHeight = 0;
totalHeight += [self.titleLabel sizeThatFits:size].height;
totalHeight += [self.contentLabel sizeThatFits:size].height;
totalHeight += [self.contentImageView sizeThatFits:size].height;
totalHeight += [self.usernameLabel sizeThatFits:size].height;
totalHeight += 40; // margins
return CGSizeMake(size.width, totalHeight);
}
#endif
@end
开始编写我们最重要的类LDViewController.在编写这个类之前，我们需要使用FDTemplateLayoutCellFDTemplateLayoutCell
，并且将TableViewController与LDViewController进行关联
LDViewController.h
#import <UIKit/UIKit.h>
@interface FDFeedViewController : UITableViewController
@end
TableView的使用有不明白的可以去学习下，这里不做解释了，注释中给出了重点的地方讲解，设置data source以及设置Delegate在程序中做出区分
LDViewController.m
#import "LDViewController.h"
#import "UITableView+FDTemplateLayoutCell.h"
#import "LDEntity.h"
#import "LDCell.h"
@interface LDViewController ()<UIActionSheetDelegate>
@property (nonatomic, copy) NSArray *prototypeEntitiesFromJSON;
@property (nonatomic, strong) NSMutableArray *feedEntitySections; // 2d array
@property (nonatomic, assign) BOOL cellHeightCacheEnabled;
@end
@implementation LDViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.tableView.estimatedRowHeight = 200;
self.tableView.fd_debugLogEnabled = YES;
self.cellHeightCacheEnabled = YES;
[self buildTestDataThen:^{
self.feedEntitySections = @[].mutableCopy;
[self.feedEntitySections addObject:self.prototypeEntitiesFromJSON.mutableCopy];
[self.tableView reloadData];
}];
}
- (void)buildTestDataThen:(void (^)(void))then
{
// 模拟一个异步请求
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// 读取数据从 `data.json`
NSString *dataFilePath = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"json"];
NSData *data = [NSData dataWithContentsOfFile:dataFilePath];
NSDictionary *rootDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
NSArray *feedDicts = rootDict[@"feed"];
// 讲数据转化为 `LDEntity`
NSMutableArray *entities = @[].mutableCopy;
[feedDicts enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[entities addObject:[[LDEntity alloc] initWithDictionary:obj]];
}];
self.prototypeEntitiesFromJSON = entities;
// 重返
dispatch_async(dispatch_get_main_queue(), ^{
!then ?: then();
});
});
}
//设置数据源
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.feedEntitySections.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.feedEntitySections[section] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//LDCell为Main.storyboard中的cell控件
LDCell *cell = [tableView dequeueReusableCellWithIdentifier:@"LDCell" forIndexPath:indexPath];
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
- (void)configureCell:(LDCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
cell.fd_enforceFrameLayout = NO; // Enable to use "-sizeThatFits:"
if (indexPath.row % 2 == 0) {
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
} else {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
cell.entity = self.feedEntitySections[indexPath.section][indexPath.row];
}
//设置委托
#pragma mark - UITableViewDelegate
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (self.cellHeightCacheEnabled) {
//LDCell为Main.storyboard中的cell控件
return [tableView fd_heightForCellWithIdentifier:@"LDCell" cacheByIndexPath:indexPath configuration:^(LDCell *cell) {
[self configureCell:cell atIndexPath:indexPath];
}];
} else {
return [tableView fd_heightForCellWithIdentifier:@"LDCell" configuration:^(LDCell *cell) {
[self configureCell:cell atIndexPath:indexPath];
}];
}
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
NSMutableArray *mutableEntities = self.feedEntitySections[indexPath.section];
[mutableEntities removeObjectAtIndex:indexPath.row];
[self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
}
@end
如果你想有自己的cell,你可以这么做:
#import "UITableView+FDTemplateLayoutCell.h"
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [tableView fd_heightForCellWithIdentifier:@"reuse identifer" configuration:^(id cell) {
// 配置此Cell(单元格)的数据, 同你在"-tableView:cellForRowAtIndexPath:"做了什么一样
// 像这样:
// cell.entity = self.feedEntities[indexPath.row];
}];
}
下面制作我们的最后一个功能就是下拉刷新操作
我们使用UITableViewController自带的UIRefreshControl
在LDViewController.m中添加此方法，并且与UIRefreshControl关联
//重新加载数据
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.feedEntitySections removeAllObjects];
[self.feedEntitySections addObject:self.prototypeEntitiesFromJSON.mutableCopy];
[self.tableView reloadData];
[sender endRefreshing];
});
效果如下：
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时间： 2024-08-27 12:20:19