27th article: QQ friends list, Uitableviewheaderfooterview usage

1. Set the TableView Headerview Note to the following:

#pragma Mark-tableview Proxy Method-(UIView *) TableView: (UITableView *) TableView viewforheaderinsection: (Nsinteger) section{    //Get a custom Headerview    Qjheaderview * Headerview = [Qjheaderview Headerviewwithtableview:tableview];        Set data    Headerview.friendgroup = self.friendgroups[section];        Set proxy object    headerview.delegate = self;        return Headerview;} -(CGFloat) TableView: (UITableView *) TableView heightforheaderinsection: (nsinteger) section{    return 60;}

Uitableviewheaderfooterview:
/** when the initialization Headerview is finished, the system automatically calls the method to set the child control's frame, which is the method in UIView */
-(void) layoutsubviews;
"Can be reused, similar to UITableViewCell
UIButton:
*//* The following two settings make the picture conversion angle is not deformed
Do I need to cut out the part of the country when the picture goes beyond the bounds border?
HeaderBtn.imageView.clipsToBounds = NO;
Set Picture content mode centered
HeaderBtn.imageView.contentMode = Uiviewcontentmodecenter;
//Add HEADERBTN to monitor click events
[Headerbtn addtarget:self Action: @selector (headerviewdidclicked) forcontrolevents:uicontroleventtouchupinside];
Set HEADERBTN Content Horizontal alignment

Headerbtn.contenthorizontalalignment = Uicontrolcontenthorizontalalignmentleft;

：

Code MVC Pattern:

Model:

////qjfriend.h//11-qq buddy list////Created by Gujer on 15/10/3.//copyright©2015 year itcast. All rights reserved.//#import <Foundation/Foundation.h> @interface qjfriend:nsobject@property (nonatomic,copy) NSString * icon; @property (nonatomic,copy) NSString * intro; @property (nonatomic,copy) nsstring * name; @property ( NONATOMIC,ASSIGN,GETTER=ISVIP) BOOL vip;+ (instancetype) friendwithdictionary: (Nsdictionary *) dic;-(instancetype) Initwithdictionary: (Nsdictionary *) dic; @end 

  qjfriend.m//  11-qq friends list////  Created by Gujer on 15/10/3.//  copyright©2015 year itcast. All rights reserved.//#import "QJFriend.h" @implementation qjfriend+ (Instancetype) Friendwithdictionary: ( Nsdictionary *) dic{    return [[Self alloc] initwithdictionary:dic];} -(Instancetype) Initwithdictionary: (nsdictionary *) dic{        if (self = [super init]) {        Self.icon = dic[@ "icon"];        Self.name = dic[@ "name"];        Self.intro = dic[@ "Intro"];        SELF.VIP = [dic[@ "VIP"] intvalue];    }    return self;} @end

////qjfriendgroup.h//11-qq buddy list////Created by Gujer on 15/10/3.//copyright©2015 year Itcas T. All rights reserved.//#import <Foundation/Foundation.h> @class qjfriend @interface qjfriendgroup:nsobject/** Storage is the qjfrined model */@property (Nonatomic,strong) nsarray * friends; @property (nonatomic,copy) nsstring * name; @property ( nonatomic,assign) int online; @property (nonatomic,assign,getter=isgroupopen) BOOL groupopened;+ (instancetype) Friendgroupwithdictionary: (Nsdictionary *) dic;-(instancetype) initwithdictionary: (Nsdictionary *) dic; @end 

  qjfriendgroup.m//  11-qq friends list////  Created by Gujer on 15/10/3.//  copyright©2015 year itcast. All rights reserved.//#import "QJFriendGroup.h" #import "QJFriend.h" @implementation qjfriendgroup+ (Instancetype) Friendgroupwithdictionary: (nsdictionary *) dic{    return  [[Qjfriendgroup alloc]initwithdictionary:dic];} -(Instancetype) Initwithdictionary: (nsdictionary *) dic{    if (self = [super init]) {        self.name = dic[@ "name"];        Self.online = [dic[@ "online"] intvalue];        Self.friends = dic[@ "Friends"];        self.groupopened = NO;        Nsmutablearray * Friends = [Nsmutablearray array];        For (Nsdictionary * dict in self.friends) {            qjfriend * frienddata = [qjfriend friendwithdictionary:dict];            [Friends Addobject:frienddata];        }        Self.friends = friends;    }        return self;} @end

View:

  qjfriendcell.h//  11-qq friends list////  Created by Gujer on 15/10/3.//  copyright©2015 year itcast. All rights reserved.//#import <UIKit/UIKit.h> @class qjfriend @interface qjfriendcell:uitableviewcell@property (Nonatomic, weak) Qjfriend * frienddata;+ (instancetype) Friendcellwithtableview: (UITableView *) TableView; @end

  qjfriendcell.m//  11-qq friends list////  Created by Gujer on 15/10/3.//  copyright©2015 year itcast. All rights reserved.//#import "QJFriendCell.h" #import "QJFriend.h" @implementation qjfriendcell+ (Instancetype) Friendcellwithtableview: (UITableView *) tableview{    static NSString * ID = @ "Friendcell";    Qjfriendcell * cell = [TableView dequeuereusablecellwithidentifier:id];    if (cell = = nil) {        cell = [[self alloc]initwithstyle:uitableviewcellstylesubtitle reuseidentifier:id];    }    return cell;} -(void) Setfrienddata: (Qjfriend *) frienddata{    _frienddata = frienddata;        Self.imageView.image = [UIImage ImageNamed:friendData.icon];    Self.textLabel.text = Frienddata.name;    Self.detailTextLabel.text = Frienddata.intro;} @end

Main:

  qjheaderview.h//  11-qq friends list////  Created by Gujer on 15/10/3.//  copyright©2015 year itcast. All rights reserved.//#import <UIKit/UIKit.h> @class qjfriendgroup, Qjheaderview; @protocol qjheaderviewdelegate <NSObject> @optional-(void) headerviewdidclicked: (Qjheaderview *) Headerview; @end @interface Qjheaderview: Uitableviewheaderfooterview@property (nonatomic, weak) qjfriendgroup * friendgroup; @property (nonatomic, weak) id< Qjheaderviewdelegate> delegate;+ (Instancetype) Headerviewwithtableview: (UITableView *) TableViw; @end

qjheaderview.m//11-qq Friends List////Created by Gujer on 15/10/3.//copyright©2015 year itcast. All rights reserved.//#import "QJHeaderView.h" #import "QJFriendGroup.h" @interface Qjheaderview () @property (nonatomic , weak) UIButton * HEADERBTN; @property (nonatomic, weak) UILabel * headerlabel;-(void) headerviewdidclicked;@ End@implementation qjheaderview/** Create a Headerview */+ (instancetype) Headerviewwithtableview: (UITableView *) TABLEVIW    {static NSString * ID = @ "Headerview";    Find Reusable Headerview Qjheaderview * Headerview = [Tableviw dequeuereusableheaderfooterviewwithidentifier:id];    if (Headerview = = nil) {Headerview = [[Qjheaderview alloc]initwithreuseidentifier:id];    }//headerView.friendGroup.groupOpened = NO; return Headerview;} /** Override initialization method Add control */-(instancetype) Initwithreuseidentifier: (NSString *) reuseidentifier{if (self = [Super Initwithr       Euseidentifier:reuseidentifier]) {//1. Add a by-chick UIButton * headerbtn = [[UIButton alloc]init]; Set padding headerbtn.titleedgeinsets = Uiedgeinsetsmake (0, 10, 0, 0);        Headerbtn.contentedgeinsets = Uiedgeinsetsmake (0, 10, 0, 0);        Set background Image [Headerbtn setbackgroundimage:[uiimage imagenamed:@ "BUDDY_HEADER_BG"] forstate:uicontrolstatenormal]; [Headerbtn setbackgroundimage:[uiimage imagenamed:@ "buddy_header_bg_highlighted"] forState:        Uicontrolstatehighlighted]; You must call the method when you set the image in the button, and you cannot use it.  Imageview.image to set [headerbtn setimage:[uiimage imagenamed:@ "Buddy_header_arrow"] forstate: (UIControlStateNormal)]                ;        * The following two settings make the picture conversion angle is not deformed//when the country picture beyond the boundaries of the bounds if you need to cut out the part of headerBtn.imageView.clipsToBounds = no;                Set picture content mode centered headerBtn.imageView.contentMode = Uiviewcontentmodecenter;        Set the font color for title [Headerbtn Settitlecolor:[uicolor Blackcolor] forstate:uicontrolstatenormal]; Add HEADERBTN Listener Click event [headerbtn addtarget:self Action: @selector (headerviewdidclicked) ForcontroLevents:uicontroleventtouchupinside];        Set HEADERBTN content Horizontal Alignment headerbtn.contenthorizontalalignment = Uicontrolcontenthorizontalalignmentleft;        [Self.contentview ADDSUBVIEW:HEADERBTN];                        SELF.HEADERBTN = headerbtn;        2. Add a Label control UILabel * Headerlabel = [[UILabel alloc]init];        Headerlabel.textalignment = Nstextalignmentright;        Headerlabel.textcolor = [Uicolor Graycolor];        [Self.contentview Addsubview:headerlabel];            Self.headerlabel = Headerlabel; } return self;} /** call */-(void) headerviewdidclicked{//state Transform self.friendGroup.groupOpened =!SELF.FRIENDGROUP.G when headerbtn by Chick is clicked    roupopened; The picture turns an angle if (self.friendGroup.isGroupOpen) {self.headerBtn.imageView.transform = Cgaffinetransformmakerotation    (m_pi_2);    } else{self.headerBtn.imageView.transform = cgaffinetransformmakerotation (0); }//Call proxy method if ([Self.delegate respondstoselector: @selector (H(eaderviewdidclicked:)]) {[Self.delegate headerviewdidclicked:self]; }}/** when the initialization Headerview is complete, the system automatically calls the method to set the child control's frame */-(void) layoutsubviews{//NSLog (@ "%@---%@", nsstringfromcgrect (    Self.bounds), Nsstringfromcgrect (Self.frame));        #warning mark-Make sure to call, otherwise the child controls have some functionality that cannot be used//NOTE: Be sure to initialize the parent [Super Layoutsubviews];        Sets the position of the child control in the Contentview self.headerBtn.frame = self.bounds;    CGFloat W = 100;    CGFloat H = self.frame.size.height;    CGFloat Y = 0;    CGFloat X = self.frame.size.width-w-10; Self.headerLabel.frame = CGRectMake (X, Y, W, H);}    /** Initialize content in Headerview */-(void) Setfriendgroup: (Qjfriendgroup *) friendgroup{_friendgroup = Friendgroup;        Set content in Headerbtn [self.headerbtn setTitle:friendGroup.name forstate:uicontrolstatenormal]; Set content in Headerlabel Self.headerLabel.text = [NSString stringwithformat:@ "%d/%lu", Friendgroup.online, FriendGroup.friends.count];} @end

Controller:

  viewcontroller.h//  11-qq friends list////  Created by Gujer on 15/10/3.//  copyright©2015 year itcast. All rights reserved.//#import <UIKit/UIKit.h> @interface viewcontroller:uiviewcontroller@end

viewcontroller.m//11-qq Friends List////Created by Gujer on 15/10/3.//copyright©2015 year itcast. All rights reserved.//#import "ViewController.h" #import "QJFriendGroup.h" #import "QJFriendCell.h" #import " QJHeaderView.h "@interface Viewcontroller () <uitableviewdatasource,uitableviewdelegate,qjheaderviewdelegate > @property (Weak, nonatomic) Iboutlet UITableView *tableview; @property (strong,nonatomic) Nsarray * friendgroups;@    End@implementation viewcontroller-(void) viewdidload {[Super viewdidload];    Self.tableView.dataSource = self;    Self.tableView.delegate = self;    Set the height of each cell per group self.tableView.rowHeight = 60; }-(BOOL) prefersstatusbarhidden{return YES; /** Initialize data content */-(Nsarray *) friendgroups{if (_friendgroups = nil) {Nsarray * groups = [Nsarray arraywithconten        Tsoffile:[[nsbundle mainbundle]pathforresource:@ "Friends.plist" Oftype:nil]];        Nsmutablearray * friendgroups = [Nsmutablearray array];          For (Nsdictionary * dic in groups) {  Qjfriendgroup * Friendgroup = [Qjfriendgroup friendgroupwithdictionary:dic];        [Friendgroups Addobject:friendgroup];    } _friendgroups = friendgroups; } return _friendgroups;} #pragma mark-tableview Data source Method-(Nsinteger) Numberofsectionsintableview: (UITableView *) tableview{return Self.friendGroups.count;} -(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (nsinteger) section{Qjfriendgroup * group = Self    . Friendgroups[section]; Return (Group.isgroupopen group.friends.count:0);}     -(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) indexpath{//Create a cell        Qjfriendcell * cell = [Qjfriendcell Friendcellwithtableview:tableview];    Set Data Qjfriendgroup * group = self.friendgroups[indexpath.section];    Qjfriend * frienddata = Group.friends[indexpath.row];        Cell.frienddata = Frienddata; return cell;} -(NSString *) TableView: (UITableView *) TableView TitleforheaderinsectIon: (Nsinteger) section{//qjfriendgroup * Group = self.friendgroups[section];//return group.name;//} #pragma mark- TableView Proxy Method-(UIView *) TableView: (UITableView *) TableView viewforheaderinsection: (nsinteger) section{//Get a custom        Headerview Qjheaderview * Headerview = [Qjheaderview Headerviewwithtableview:tableview];        Set data Headerview.friendgroup = Self.friendgroups[section];        Set proxy object headerview.delegate = self; return Headerview;} -(CGFloat) TableView: (UITableView *) TableView heightforheaderinsection: (nsinteger) section{return 60;} #pragma Mark-qjheaderview proxy Method-(void) headerviewdidclicked: (Qjheaderview *) headerview{[Self.tableview reloaddata];} @end

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27th article: QQ friends list, Uitableviewheaderfooterview usage