iOS下拉选择菜单简单封装

本文实例为大家分享了简单封装的ios下拉选择菜单代码，供大家参考，具体内容如下

// 
// orderlistdownmenu.h 
 
#import <uikit/uikit.h> 
 
@protocol orderlistdownmenudelegate <nsobject> 
 
- (void)orderlistdownmenu:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath; 
 
@end 
 
typedef void(^dismiss)(void); 
 
@interface orderlistdownmenu : uiview<uitableviewdatasource, uitableviewdelegate> 
 
@property (nonatomic, strong) uitableview *tableview; 
@property (nonatomic, assign) id<orderlistdownmenudelegate> delegate; 
@property (nonatomic, strong) nsarray *arrdata; 
@property (nonatomic, strong) nsarray *arrimgname; 
@property (nonatomic, copy) dismiss dismiss; 
 
- (instancetype)initwithdataarr:(nsarray *)dataarr origin:(cgpoint)origin width:(cgfloat)width rowheight:(cgfloat)rowheight; 
 
- (void)dismisswithcompletion:(void (^)(orderlistdownmenu *object))completion; 
 
@end 

#import "orderlistdownmenu.h" 
 
#define toptoview 63.0f 
#define righttoview kscreenwidth - 15.0f 
#define lefttoview kscreenwidth - 145.0 - 10.0f 
#define celllineedgeinsets uiedgeinsetsmake(0, -80, 0, 0) 
#define kscreenwidth    [uiscreen mainscreen].bounds.size.width 
#define kscreenheight    [uiscreen mainscreen].bounds.size.height 
 
@interface orderlistdownmenu() 
 
@property (nonatomic, assign) cgpoint origin; 
@property (nonatomic, assign) cgfloat rowheight; 
 
@end 
 
@implementation orderlistdownmenu 
 
- (instancetype)initwithdataarr:(nsarray *)dataarr origin:(cgpoint)origin width:(cgfloat)width rowheight:(cgfloat)rowheight { 
   
  self = [super initwithframe:cgrectmake(0, 0, kscreenwidth, kscreenheight)]; 
  if (self) { 
    if (rowheight <= 0) { 
      rowheight = 50; 
    } 
     
    // 设置背景颜色 
    self.backgroundcolor = [uicolor colorwithred:0 green:0 blue:0 alpha:0.2]; 
    self.origin = origin; 
    self.rowheight = rowheight; 
    self.arrdata = [dataarr copy]; 
    self.tableview = [[uitableview alloc] initwithframe:cgrectmake(origin.x + lefttoview, origin.y + toptoview, width, rowheight * dataarr.count) style:uitableviewstyleplain]; 
    _tableview.datasource = self; 
    _tableview.delegate = self; 
    [self addsubview:_tableview]; 
     
    _tableview.backgroundcolor = [uicolor whitecolor]; 
    _tableview.layer.cornerradius = 2; 
    _tableview.bounces = no; 
    _tableview.layer.cornerradius = 8; 
    _tableview.separatorcolor = [uicolor colorwithwhite:0.3 alpha:1]; 
    
    _tableview.separatorstyle = uitableviewcellselectionstylenone; 
    [_tableview registerclass:[uitableviewcell class] forcellreuseidentifier:@"cell"]; 
     
    if ([self.tableview respondstoselector:@selector(setseparatorinset:)]) { 
      [self.tableview setseparatorinset:celllineedgeinsets]; 
    } 
     
    if ([self.tableview respondstoselector:@selector(setlayoutmargins:)]) { 
      [self.tableview setlayoutmargins:celllineedgeinsets]; 
    } 
  } 
  return self; 
} 
 
- (void)layoutsubviews { 
  [super layoutsubviews]; 
} 
 
- (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section { 
  return self.arrdata.count; 
} 
 
- (cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath { 
  return self.rowheight; 
} 
 
- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { 
   
  uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:@"cell"]; 
  cell.textlabel.textcolor = theme_color_gray_1; 
  cell.textlabel.font = [uifont systemfontofsize:15]; 
  cell.textlabel.text = self.arrdata[indexpath.row]; 
   
  if (self.arrimgname.count > indexpath.row) { 
    cell.imageview.image = [uiimage imagenamed:self.arrimgname[indexpath.row]]; 
    cell.imageview.contentmode = uiviewcontentmodescaleaspectfit; 
  } 
   
  uilabel *label = [[uilabel alloc] init]; 
  label.frame = cgrectmake(0, 49, _tableview.frame.size.width, 0.5); 
  label.backgroundcolor = theme_separator_color; 
  [cell.contentview addsubview:label]; 
   
  return cell; 
} 
 
- (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { 
   
  if([self.delegate respondstoselector:@selector(orderlistdownmenu:didselectrowatindexpath:)]){ 
    [self.delegate orderlistdownmenu:tableview didselectrowatindexpath:indexpath]; 
  } 
   
  [tableview deselectrowatindexpath:indexpath animated:yes]; 
  [self dismisswithcompletion:nil]; 
} 
 
- (void)dismisswithcompletion:(void (^)(orderlistdownmenu *object))completion { 
   
  __weak __typeof(self) weakself = self; 
  [uiview animatewithduration:0.2 animations:^{ 
    weakself.alpha = 0; 
    weakself.tableview.frame = cgrectmake(weakself.origin.x + lefttoview + 145, weakself.origin.y + toptoview, 0, 0); 
  } completion:^(bool finished) { 
    [weakself removefromsuperview]; 
    if (completion) { 
      completion(weakself); 
    } 
    if (weakself.dismiss) { 
      weakself.dismiss(); 
    } 
  }]; 
} 
 
- (void)touchesbegan:(nsset<uitouch *> *)touches withevent:(uievent *)event { 
   
  uitouch *touch = [touches anyobject]; 
  if (![touch.view isequal:self.tableview]) { 
    [self dismisswithcompletion:nil]; 
  } 
} 
 
- (void)drawrect:(cgrect)rect { 
   
  //[colors[serie] setfill]; 
   
  //拿到当前视图准备好的画板 
   
  cgcontextref context = uigraphicsgetcurrentcontext(); 
   
  //利用path进行绘制三角形 
   
  cgcontextbeginpath(context);//标记 
   
  cgcontextmovetopoint(context, 
             righttoview - 13, 53);//设置起点 
   
  cgcontextaddlinetopoint(context, 
              righttoview - 21, toptoview); 
   
  cgcontextaddlinetopoint(context, 
              righttoview - 4, toptoview); 
   
  cgcontextclosepath(context);//路径结束标志，不写默认封闭 
   
 
  [self.tableview.backgroundcolor setfill]; //设置填充色 
   
  [self.tableview.backgroundcolor setstroke]; //设置边框颜色 
   
  cgcontextdrawpath(context, 
           kcgpathfillstroke);//绘制路径path 
} 
 
@end 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。