IOS implementation UITableView data is empty when the prompt page _ios

Objective

It is believed that for iOS developers, in the development process, often with UITableView, will encounter data is empty situation, then need to put a picture on the empty page and a line of text hint data is empty, the following two methods to achieve this function.

The first is to inherit UITableView and integrate pictures and text in the new class

#import <UIKit/UIKit.h>
#import "Const.h"

@interface wfemptytableview:uitableview

@property ( Nonatomic, assign) BOOL Showemptytipview; Whether to display background hint text
@property (nonatomic, assign) Nsinteger Voffset;
@property (nonatomic, copy) NSString *tipstring;  Hint text
@property (nonatomic, copy) NSString *tipimagename;//hint picture

@end

Concrete implementation

#import "WFEmptyTableView.h" @implementation Wfemptytableview {UIView *_custombackview;
 Uiimageview *_tipimageview;
 Uilabel *_label;
 CGRect _imageframe;
 CGRect _labelframe;
Double _scale; }-(Wfemptytableview *) initWithFrame: (CGRect) Frame style: (Uitableviewstyle) style {self = [super Initwithframe:frame St
 Yle:style];
 if (self) {[self setupviews];
return self;
 }-(void) setupviews {_custombackview = [[UIView alloc] initWithFrame:self.frame];

 _custombackview.backgroundcolor = [Uicolor Yellowcolor]; _tipimageview = [[Uiimageview alloc] Initwithframe:cgrectmake ((KSCREENWIDTH-200/2)/2, SELF.FRAME.SIZE.HEIGHT/3, 200/
 2, 200/2)];
 [_custombackview Addsubview:_tipimageview];

 _imageframe = _tipimageview.frame;

 _label = [[Uilabel alloc] Initwithframe:cgrectmake (0, Cgrectgetmaxy (_tipimageview.frame), Kscreenwidth, 100)];
 _label.backgroundcolor = [Uicolor Clearcolor];
 _label.textalignment = Nstextalignmentcenter;
 _label.textcolor = [Uicolor Lightgraycolor]; _label.Font = [Uifont systemfontofsize:16];
 _label.linebreakmode = nslinebreakbycharwrapping;
 _label.numberoflines = 0;
 [_custombackview Addsubview:_label];

_labelframe = _label.frame;
 }-(void) Setshowemptytipview: (BOOL) showemptytipview {_showemptytipview = Showemptytipview;
 if (Showemptytipview) {[Self addsubview:_custombackview];
 else {[_custombackview removefromsuperview];

 }-(void) settipstring: (NSString *) tipstring {_tipstring = tipstring;
 nsmutableattributedstring * attributedString1 = [[Nsmutableattributedstring alloc] initwithstring:tipstring];
 Nsmutableparagraphstyle * ParagraphStyle1 = [[Nsmutableparagraphstyle alloc] init];
 [ParagraphStyle1 setlinespacing:15];
 [ParagraphStyle1 Setalignment:nstextalignmentcenter]; [AttributedString1 addattribute:nsparagraphstyleattributename Value:paragraphstyle1 range:nsmakerange (0, [
 Tipstring length])];

 [_label setattributedtext:attributedstring1];
[Self resetframe]; }-(void) Settipimagename: (NSString *) tipimageName {_scale = 1;
 UIImage *image = [UIImage imagenamed:tipimagename];
 _scale = Image.size.height*1.0/image.size.width;

 _tipimageview.image = image;
 if (isNaN (_scale)) {_scale = 1;
} [self resetframe]; }-(void) Setvoffset: (Nsinteger) voffset {_label.frame = CGRectMake (Cgrectgetminx (_label.frame), Cgrectgetminy (_
 Label.frame) +voffset, Cgrectgetwidth (_label.frame), Cgrectgetheight (_label.frame)); _tipimageview.frame = CGRectMake (Cgrectgetminx (_tipimageview.frame), Cgrectgetminy (_tipimageview.frame) +vOffset,
Cgrectgetwidth (_tipimageview.frame), Cgrectgetheight (_tipimageview.frame));
 }-(void) resetframe {_tipimageview.frame = CGRectMake (0, Cgrectgetminy (_tipimageview.frame), _scale);

 _tipimageview.center = Cgpointmake (kscreenwidth/2.0, _TIPIMAGEVIEW.CENTER.Y); _label.frame = CGRectMake (Cgrectgetminx (_label.frame), Cgrectgetmaxy (_tipimageview.frame), CGRectGetWidth (_
Label.frame), Cgrectgetheight (_label.frame)); } @end

There is another way to use category

#import <UIKit/UIKit.h>

@interface uitableview (wfempty)

@property (nonatomic, Strong, ReadOnly) UIView *emptyview;

-(void) Addemptyviewwithimagename: (nsstring*) imagename title: (nsstring*) title;

@end

Concrete implementation

#import "Uitableview+wfempty.h" #import <objc/runtime.h> static char Uitableviewemptyview;

@implementation UITableView (wfempty) @dynamic Emptyview;

-(UIView *) Emptyview {return objc_getassociatedobject (self, &uitableviewemptyview);}
 -(void) Setemptyview: (UIView *) Emptyview {[Self willchangevalueforkey:@ ' hjemptyview '];
 Objc_setassociatedobject (self, &uitableviewemptyview, Emptyview, objc_association_assign);
[Self didchangevalueforkey:@ "Hjemptyview"];  }-(void) Addemptyviewwithimagename: (nsstring*) imagename title: (nsstring*) title {if (!self.emptyview) {CGRect frame
  = CGRectMake (0, 0, self.frame.size.width, self.frame.size.height);
  uiimage* image = [UIImage imagenamed:imagename];

  nsstring* Text = title;
  uiview* Nomessageview = [[UIView alloc] initwithframe:frame];

  Nomessageview.backgroundcolor = [Uicolor Clearcolor]; Uiimageview *carimageview = [[Uiimageview alloc] Initwithframe:cgrectmake ((frame.size.width-image.size.width)/2, Image.size.width, image.size.height)];
  [Carimageview Setimage:image];

  [Nomessageview Addsubview:carimageview];
  Uilabel *noinfolabel = [[Uilabel alloc] Initwithframe:cgrectmake (0, 160, Frame.size.width, 20)];
  Noinfolabel.textalignment = Nstextalignmentcenter;
  Noinfolabel.textcolor = [Uicolor Lightgraycolor];
  Noinfolabel.text = text;
  Noinfolabel.backgroundcolor = [Uicolor Clearcolor];
  Noinfolabel.font = [Uifont systemfontofsize:20];

  [Nomessageview Addsubview:noinfolabel];

  [Self addsubview:nomessageview];
 Self.emptyview = Nomessageview; }} @end

Summarize

The above is the entire content of this article, I hope the content of this article for everyone's study or work can bring certain help, if you have questions you can message exchange.