上下拉刷新之第三方库MJRefresh 的具体使用——（用于UITabView的数据刷新）
第三方下载网址：http://pan.baidu.com/s/1ntHWClj
步骤如下：
第一步：下载第三方库MJRefresh
第二步：将头文件MJRefresh.h导入到pch文件或UITabView所在的控制器中。
第三步：将UITabView所在的控制器关闭ARC 方法如下：
重写控制器的dealloc方法，在此方法内将属于此控制器的对象release一次
具体代码如下：
新建数据请求的类如下：
// // MethodsofRest.h // 创业项目工程 // // Created by apple on 15/9/23. // Copyright (c) 2015年 LiuXun. All rights reserved. // #import <Foundation/Foundation.h> @interface MethodsofRest : NSObject <ASIHTTPRequestDelegate> @property (nonatomic, strong) NSString *jsonStr; @property(nonatomic, strong) NSString *url; @property(nonatomic, strong)ASIHTTPRequest *reques; -(id) init:(NSString *) url; -(NSString *) jsonString; @end编辑其.m文件如下：
//
// MethodsofRest.m
// 创业项目工程
//
// Created by apple on 15/9/23.
// Copyright (c) 2015年 LiuXun. All rights reserved.
//
#import "MethodsofRest.h"
@implementation MethodsofRest
-(id) init:(NSString *) url
{
if (self = [super init]) {
self.url = url;
}
return self;
}
-(void) requestFinished:(ASIHTTPRequest *)request
{
NSString *json = request.responseString;
self.jsonStr = json;
}
-(void) requestFailed:(ASIHTTPRequest *)request
{
NSLog(@"数据请求失败");
}
-(NSString *)jsonString
{
_reques = [[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:self.url]];
[_reques setRequestMethod:@"GET"];
_reques.delegate = self;
[_reques startSynchronous]; // 如果要独立抽取到一个类中，必须要用同步请求
return self.jsonStr;
}
@end
观察获取的json字符串如下：整体是一个大字典 即一个大的Model，里面有一个字典数组 即小Model数组
// // CustomModel.h // 创业项目工程 // // Created by apple on 15/9/26. // Copyright (c) 2015年 LiuXun. All rights reserved. // #import <Foundation/Foundation.h> @interface CustomModel : NSObject <NSCoding> @property(nonatomic, strong) NSString *AgentName; @property(nonatomic, strong) NSString *Moblie; @property(nonatomic, strong) NSString *Idcard; @property(nonatomic, strong) NSString *TypeName; @property(nonatomic, strong) NSString *AddTime; @property(nonatomic, strong) NSString *Status; -(instancetype) initWithDict:(NSDictionary *) dict; +(instancetype) customWithDict:(NSDictionary *) dict; @end编辑CustomModel.m文件如下：
//
// CustomModel.m
// 创业项目工程
//
// Created by apple on 15/9/26.
// Copyright (c) 2015年 LiuXun. All rights reserved.
//
#import "CustomModel.h"
@implementation CustomModel
-(instancetype) initWithDict:(NSDictionary *) dict
{
if (self = [super init]) {
[self setValuesForKeysWithDictionary:dict];
}
return self;
}
+(instancetype) customWithDict:(NSDictionary *) dict
{
return [[self alloc] initWithDict:dict];
}
/*为了增加程序的拓展性，可以为model类添加编码解码方法*/
-(void) encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.AgentName forKey:@"AgentName"];
[aCoder encodeObject:self.Moblie forKey:@"Moblie"];
[aCoder encodeObject:self.Idcard forKey:@"Idcard"];
[aCoder encodeObject:self.TypeName forKey:@"TypeName"];
[aCoder encodeObject:self.AddTime forKey:@"AddTime"];
[aCoder encodeObject:self.Status forKey:@"Status"];
}
-(id) initWithCoder:(NSCoder *)aDecoder
{
if (self = [super init]) {
self.AgentName = [aDecoder decodeObjectForKey:@"AgentName"];
self.Moblie = [aDecoder decodeObjectForKey:@"Moblie"];
self.Idcard = [aDecoder decodeObjectForKey:@"Idcard"];
self.TypeName = [aDecoder decodeObjectForKey:@"TypeName"];
self.AddTime = [aDecoder decodeObjectForKey:@"AddTime"];
self.Status = [aDecoder decodeObjectForKey:@"Status"];
}
return self;
}
/*为了便于调试程序，为其重写description方法*/
-(NSString *)description
{
NSString *t = [NSString stringWithFormat:@"%@-%@-%@-%@-%@-%@",self.AgentName, self.Moblie,self.Idcard,self.TypeName,self.AddTime,self.Status];
return t;
}
@end
新建一个表示一个用户的所有客户Model以及有关信息的类
编辑CustomsOfUser.h如下：
// // CustomsOfUser.h // 创业项目工程 // // Created by apple on 15/9/26. // Copyright (c) 2015年 LiuXun. All rights reserved. // #import <Foundation/Foundation.h> @interface CustomsOfUser : NSObject <NSCoding> @property(nonatomic, assign) int error; @property(nonatomic, strong) NSString *message; @property (nonatomic, strong) NSArray *list; -(instancetype) initWithDict:(NSDictionary *) dict; +(instancetype) customsOfUserWithDict:(NSDictionary *) dict; @end编辑 CustomsOfUser.m文件如下：
//
// CustomsOfUser.m
// 创业项目工程
//
// Created by apple on 15/9/26.
// Copyright (c) 2015年 LiuXun. All rights reserved.
//
#import "CustomsOfUser.h"
@implementation CustomsOfUser
-(instancetype) initWithDict:(NSDictionary *) dict
{
if (self = [super init]) {
[self setValuesForKeysWithDictionary:dict]; // 先统一对应赋值以下
//再对数组内的字典对象转为model对象进行赋值存放
NSMutableArray *modelArray = [NSMutableArray array];
for (NSDictionary *dictCustoms in dict[@"list"]) {
CustomModel * model = [CustomModel customWithDict:dictCustoms];
[modelArray addObject:model];
}
self.list = modelArray;
}
return self;
}
+(instancetype) customsOfUserWithDict:(NSDictionary *) dict
{
return [[self alloc] initWithDict:dict];
}
/*为了以后可以写入把对象写入文件,在此添加编码解码方法*/
-(void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:[NSNumber numberWithInt:self.error] forKey:@"error"];
[aCoder encodeObject:self.message forKey:@"message"];
[aCoder encodeObject:self.list forKey:@"list"];
}
-(id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super init]) {
self.error = [[aDecoder decodeObjectForKey:@"error"] intValue];
self.message = [aDecoder decodeObjectForKey:@"message"];
self.list = [aDecoder decodeObjectForKey:@"list"];
}
return self;
}
@end
用户Model新建完成
下一步新建UItabView的自定义单元格
编辑CustomTableCell.h如下：
// // CustomTableCell.h // 创业项目工程 // // Created by apple on 15/9/26. // Copyright (c) 2015年 LiuXun. All rights reserved. // #import <UIKit/UIKit.h> @interface CustomTableCell : UITableViewCell @property (nonatomic, strong) CustomModel *model; @property (nonatomic, strong) UIImageView *imgvBack; @property (nonatomic, strong) UILabel *lblNam; @property (nonatomic, strong) UILabel *lblPhone; @property (nonatomic, strong) UILabel *lblID; @property (nonatomic, strong) UILabel *lblType; @property (nonatomic, strong) UILabel *lblAddTime; @property(nonatomic, strong) UILabel *lblStatus; @end编辑CustomTableCell.m如下：
//
// CustomTableCell.m
// 创业项目工程
//
// Created by apple on 15/9/26.
// Copyright (c) 2015年 LiuXun. All rights reserved.
//
#import "CustomTableCell.h"
@implementation CustomTableCell
-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
UIImageView *imgv = [[UIImageView alloc] init];
[self.contentView addSubview:imgv];
self.imgvBack = imgv;
UILabel *lbl1 = [[UILabel alloc] init];
[self.contentView addSubview:lbl1];
self.lblNam = lbl1;
UILabel *lbl2 = [[UILabel alloc] init];
[self.contentView addSubview:lbl2];
self.lblPhone = lbl2;
UILabel *lbl3 = [[UILabel alloc] init];
[self.contentView addSubview:lbl3];
self.lblID = lbl3;
UILabel *lbl4 = [[UILabel alloc] init];
[self.contentView addSubview:lbl4];
self.lblType = lbl4;
UILabel *lbl5 = [[UILabel alloc] init];
[self.contentView addSubview:lbl5];
self.lblAddTime = lbl5;
UILabel *lbl6 = [[UILabel alloc] init];
[self.contentView addSubview:lbl6];
self.lblStatus = lbl6;
}
return self;
}
/*重写Model的set方法，进行数据加载和属性设置*/
-(void) setModel:(CustomModel *)model
{
_model = model;
[self setFrame];
[self setData];
}
-(void) setFrame
{
self.imgvBack.image = [UIImage imageNamed:@"kehubg@2x"];
[self.imgvBack mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self).offset(-10);
make.right.equalTo(self).offset(10);
make.top.and.bottom.equalTo(self).offset(0);
}];
[self.lblNam mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self).offset(10);
make.right.equalTo(self).offset(-40);
make.top.equalTo(self).offset(10);
make.height.equalTo(self).multipliedBy(0.18);
}];
[self.lblPhone mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self).offset(10);
make.right.equalTo(self).offset(-40);
make.top.equalTo(self.lblNam.mas_bottom);
make.height.equalTo(self).multipliedBy(0.18);
}];
[self.lblID mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self).offset(10);
make.right.equalTo(self).offset(-40);
make.top.equalTo(self.lblPhone.mas_bottom);
make.height.equalTo(self).multipliedBy(0.18);
}];
[self.lblAddTime mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self).offset(10);
make.right.equalTo(self).offset(-40);
make.top.equalTo(self.lblID.mas_bottom);
make.height.equalTo(self).multipliedBy(0.18);
}];
[self.lblStatus mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self).offset(10);
make.right.equalTo(self).offset(-40);
make.top.equalTo(self.lblAddTime.mas_bottom);
make.bottom.equalTo(self).offset(-10);
}];
[self.lblType mas_makeConstraints:^(MASConstraintMaker *make) {
make.right.equalTo(self);
make.centerY.equalTo(self);
make.height.equalTo(self.mas_height).multipliedBy(0.5f);
make.width.equalTo(self.mas_width).multipliedBy(0.25);
}];
}
-(void) setData
{
NSString *name = self.model.AgentName;
NSString *phone = self.model.Moblie;
NSString *ID = self.model.Idcard;
NSString *addTime = self.model.AddTime;
NSString * status = self.model.Status;
NSString *type = self.model.TypeName;
self.lblNam.text = [NSString stringWithFormat:@"客户名称：%@",name];
self.lblPhone.text = [NSString stringWithFormat:@"联系电话：%@",phone];
self.lblID.text = [NSString stringWithFormat:@"身份证号：%@",ID];
self.lblAddTime.text = [NSString stringWithFormat:@"添加时间：%@",addTime];
self.lblStatus.text = [NSString stringWithFormat:@"客户状态：%@",status];
self.lblType.text = [NSString stringWithFormat:@"%@",type];
self.lblType.textAlignment = NSTextAlignmentCenter;
[self.lblNam setFont:[UIFont systemFontOfSize:13]];
[self.lblPhone setFont:[UIFont systemFontOfSize:12]];
[self.lblID setFont:[UIFont systemFontOfSize:12]];
[self.lblAddTime setFont:[UIFont systemFontOfSize:12]];
[self.lblStatus setFont:[UIFont systemFontOfSize:12]];
[self.lblType setFont:[UIFont systemFontOfSize:16]];
self.lblPhone.textColor = [UIColor grayColor];
self.lblID.textColor = [UIColor grayColor];
self.lblAddTime.textColor = [UIColor grayColor];
self.lblStatus.textColor = [UIColor grayColor];
self.lblType.textColor = [UIColor whiteColor];
}
@end
接下来 最重要的就是MJRefresh第三方库的使用：
CustomCrtl.h
// // CustomCrtl.h // 创业项目工程 // // Created by apple on 15/9/24. // Copyright (c) 2015年 LiuXun. All rights reserved. // #import "NavBaseCrtl.h" @interface CustomCrtl : NavBaseCrtl<UITableViewDataSource,UITableViewDelegate> // 上下刷新用的视图 @property (nonatomic, strong) UITableView *tableView; // 表格中要用到的数据存放到这个数组 @property(nonatomic, strong) NSMutableArray *listArray; // 这个变量是用来判断可以刷新的次数 @property(nonatomic, assign) int page; @endCustomCrtl.m
//
// CustomCrtl.m
// 创业项目工程
//
// Created by apple on 15/9/24.
// Copyright (c) 2015年 LiuXun. All rights reserved.
//
#import "CustomCrtl.h"
#import "MJRefresh.h"
@implementation CustomCrtl
-(NSArray *) AcquireCustomModels:(int) page
{ /*根据刷新的页码将返回的json串转换为Model数组返回*/
NSString *path = [NSString stringWithFormat:@"http://www.ddpro.com.cn/api/user/userlist?userName=%@&page=%d&pageSize=10",@"",page];
MethodsofRest *rest = [[MethodsofRest alloc] init:path];
NSString *jsonStr = [rest jsonString];
NSDictionary *customsDic = [jsonStr JSONValue];
CustomsOfUser *customsmodel = [CustomsOfUser customsOfUserWithDict:customsDic];
NSArray *models = customsmodel.list;
return models;
}
-(void)loadData
{
/*刷新一次，让此参数加一*/
self.page ++;
NSArray *array = [self AcquireCustomModels:self.page]; // 一次加载一个Page的内容
if (array.count !=0) { // 因为数组即使没有内容也不会为空，一般从数组中的元素个数判断是否有内容
[self.listArray addObjectsFromArray:array];
}
else
{
[self.tableView footerEndRefreshing]; // 让上拉刷新尾部控件停止刷新状态
}
[self.tableView reloadData];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self setLeftItem:YES andCenterName:@"我的客户"];
//初始化用到的数组
self.listArray = [NSMutableArray arrayWithCapacity:1];
//这一段是创建一个可以刷新的表格视图
self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height) ];
self.tableView.delegate = self;
self.tableView.dataSource = self;
self.tableView.rowHeight = 120;
self.tableView.showsVerticalScrollIndicator = NO;
[self.view addSubview:self.tableView];
//刚进来这个视图时先刷新一次表格视图
[self setupRefresh]; //开始时刷新一次数据
}
-(void) setupRefresh // 用于刷新数据
{
// 下拉刷新
[self.tableView addHeaderWithTarget:self action:@selector(headRefreshing) ];
[self.tableView headerBeginRefreshing]; //主动让下拉刷新头部控件进入刷新状态
// 上拉加载更多 (进入刷新状态就会调用self的footerRereshing)
[self.tableView addFooterWithTarget:self action:@selector(footerRereshing)];
// 设置上下拉时的文字（也可以不设置，默认的文字在MJRefreshConst中修改）
self.tableView.headerPullToRefreshText =@"下拉可以刷新"; // 设置头部控件的文字
self.tableView.headerReleaseToRefreshText =@"松开马上刷新"; // 下拉即将刷新时显示的文字
self.tableView.headerRefreshingText = @"刷新中"; // 设置下拉松开刷新数据时显示的文字
self.tableView.footerPullToRefreshText = @"上拉可以加载更多数据"; // 设置尾部控件的文字
self.tableView.footerReleaseToRefreshText =@"松开马上加载更多数据"; // 上拉未松开时尾部显示的文字
self.tableView.footerRefreshingText = @"加载中......"; // 设置上拉松开后显示的文字
}
// 下拉刷新
-(void)headRefreshing
{
[self loadData];
[self.tableView headerEndRefreshing]; // 让头部控件停止刷新状态
}
// 上拉加载
-(void)footerRereshing
{
[self loadData];
}
#pragma mark - TableView*
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.listArray count];
}
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CustomId = @"Custom_ID";
CustomTableCell *cell = [tableView dequeueReusableCellWithIdentifier:CustomId];
if (cell == nil) {
cell = [[CustomTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CustomId];
}
CustomModel *customModel = self.listArray[indexPath.row];
cell.model = customModel;
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
NSLog(@"内存不足");
}
-(void)viewWillAppear:(BOOL)animated
{
[self.tableView reloadData]; // 当从别的页面跳转过来时要重新刷新一次视图
}
-(void)afterPressLeft
{
// [self release]; // 注意：在此是绝对不可对自身进行release，以为pop方法会自动release
[self.navigationController popToRootViewControllerAnimated:YES];
}
-(void)dealloc
{
[self.tableView release];
[self.listArray release];
[super dealloc];
}
@end
运行结果如下：
注意：如果忘记了使用方法 打开MJRefresh.h如下所示：直接查找使用即可
/**
* 代码地址: https://github.com/CoderMJLee/MJRefresh
* 代码地址: http://code4app.com/ios/%E5%BF%AB%E9%80%9F%E9%9B%86%E6%88%90%E4%B8%8B%E6%8B%89%E4%B8%8A%E6%8B%89%E5%88%B7%E6%96%B0/52326ce26803fabc46000000
* 友情提示: 遇到一些小问题, 最好及时下载最新的代码试试
*/
#import "UIScrollView+MJRefresh.h"
/**
MJ友情提示：
1. 添加头部控件的方法
[self.tableView addHeaderWithTarget:self action:@selector(headerRereshing)];
或者
[self.tableView addHeaderWithCallback:^{ }];
2. 添加尾部控件的方法
[self.tableView addFooterWithTarget:self action:@selector(footerRereshing)];
或者
[self.tableView addFooterWithCallback:^{ }];
3. 可以在MJRefreshConst.h和MJRefreshConst.m文件中自定义显示的文字内容和文字颜色
4. 本框架兼容iOS6\iOS7，iPhone\iPad横竖屏
5.自动进入刷新状态
1> [self.tableView headerBeginRefreshing];
2> [self.tableView footerBeginRefreshing];
6.结束刷新
1> [self.tableView headerEndRefreshing];
2> [self.tableView footerEndRefreshing];
*/