右邊菜單中的按鍵，點擊彈出一個列表可選擇，選擇其中一個，響應相應的事件并把文字顯示在右邊的菜單上；彈出下拉效果使用LMDropdownView插件，可以用POD進行加載pod ‘LMDropdownView’；LMDropdownView是把想要的視圖賦給它；
源代碼地址：https://github.com/JxbSir/YiYuanYunGou
效果如下：
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1：在主頁面先定義按鍵跟綁定視圖（沒寫全的都是屬性中定義了比如btnRigth,dropdownView等）：
btnRigth = [UIButton buttonWithType:UIButtonTypeCustom]; [btnRigth addTarget:self action:@selector(btnRightAction) forControlEvents:UIControlEventTouchUpInside]; if(![OyTool ShardInstance].bIsForReview) { [self actionCustomNavBtn:btnRigth nrlImage:@"" htlImage:@"" title:@"全部分類▽"]; } else { [self actionCustomNavBtn:btnRigth nrlImage:@"" htlImage:@"" title:[dicTypeName.allValues objectAtIndex:0]]; } self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btnRigth]; AllPRoTypeView* tview = [[AllProTypeView alloc] initWithFrame:self.view.bounds]; tview.delegate = self; //賦于下拉的里效果視圖 dropdownView = [[LMDropdownView alloc] init]; dropdownView.menuBackgroundColor = [UIColor whiteColor]; dropdownView.menuContentView = tview;
2：其中對設置按鍵進行的封裝：
- (void)actionCustomNavBtn:(UIButton *)btn nrlImage:(NSString *)nrlImage htlImage:(NSString *)hltImage title:(NSString *)title { [btn setImage:[UIImage imageNamed:nrlImage] forState:UIControlStateNormal]; if (hltImage) { [btn setImage:[UIImage imageNamed:hltImage] forState:UIControlStateHighlighted]; } else { [btn setImage:[UIImage imageNamed:nrlImage] forState:UIControlStateNormal]; } if (title) { btn.titleLabel.font = [UIFont boldSystemFontOfSize:13]; [btn setTitle:title forState:UIControlStateNormal]; [btn setTitle:title forState:UIControlStateHighlighted]; [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted]; } [btn sizeToFit];}
3：其中btnRightAction響應事件內容（主要用于顯示跟隱藏下拉效果）：
- (void)btnRightAction{ if ([dropdownView isOpen]) { [dropdownView hide]; } else { //[tbViewType reloadData]; [dropdownView showInView:self.view withFrame:CGRectMake(0, 0, mainWidth, self.view.bounds.size.height)]; }}
4：AllProTypeView下拉內容的視圖代碼如下（是一個列表）：
.h文件內容#import <UIKit/UIKit.h>@protocol AllProTypeViewDelegate- (void)selectedTypeCode:(int)code;@end@interface AllProTypeView : UIView@property(nonatomic,weak)id<AllProTypeViewDelegate> delegate;@end.m文件內容@interface AllProTypeView ()<UITableViewDataSource,UITableViewDelegate>{ UITableView *tbView; NSArray *arrOfType; NSArray *arrOfTypeImage; NSInteger indexType; __weak id<AllProTypeViewDelegate> delegate;}@end@implementation AllProTypeView@synthesize delegate;- (id)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if(self) { self.backgroundColor = [UIColor redColor]; tbView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, mainWidth, frame.size.height) style:UITableViewStyleGrouped]; tbView.delegate = self; tbView.dataSource = self; tbView.backgroundColor = [UIColor whiteColor]; tbView.separatorStyle = UITableViewCellSeparatorStyleSingleLine; tbView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [self addSubview:tbView]; if(![OyTool ShardInstance].bIsForReview) { arrOfType = @[@"全部分類",@"手機數碼",@"電腦辦公",@"家用電器",@"化妝個護",@"鐘表首飾",@"其他商品"]; arrOfTypeImage = @[@"sort0",@"sort100",@"sort106",@"sort104",@"sort2",@"sort222",@"sort312"]; } else { arrOfType = @[@"家用電器",@"化妝個護",@"鐘表首飾",@"其他商品"]; arrOfTypeImage = @[@"sort104",@"sort2",@"sort222",@"sort312"]; } } return self;}#pragma mark - tableview- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ return arrOfType.count;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ return 44;}- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{ return 0.1;}- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{ return 0.1;}- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ //static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = nil;//(UITableViewCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if(cell == nil) { cell = [[UITableViewCell alloc] init]; } cell.textLabel.text = [NSString stringWithFormat:@" %@", [arrOfType objectAtIndex:indexPath.row]]; NSString* name = [arrOfTypeImage objectAtIndex:indexPath.row]; if(indexPath.row == indexType) { name = [NSString stringWithFormat:@"%@_checked",name]; cell.textLabel.textColor = mainColor; UIImageView* imgOK = [[UIImageView alloc] initWithFrame:CGRectMake(mainWidth - 32, 14, 20, 16)]; imgOK.image = [UIImage imageNamed:@"screening_select"]; [cell addSubview:imgOK]; } else { name = [NSString stringWithFormat:@"%@_normal",name]; } UIImageView* img = [[UIImageView alloc] initWithFrame:CGRectMake(16, 10, 24, 24)]; img.image = [UIImage imageNamed:name]; [cell addSubview:img]; return cell;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ [tableView deselectRowAtIndexPath:indexPath animated:YES]; indexType = indexPath.row; [tbView reloadData]; if(delegate) { NSString* code = [[arrOfTypeImage objectAtIndex:indexPath.row] stringByReplacingOccurrencesOfString:@"sort" withString:@""]; [delegate selectedTypeCode:[code intValue]]; }}@end
注意：列表有綁定是否是被選擇，它顯示的效果是不一樣的，在觸發行時對標識符進行重新賦值，把通過delegate把它傳回主視圖控件器里；
5：主控制器里響應上面delegate的內容為：
- (void)selectedTypeCode:(int)code{ iCodeType = code; [dropdownView hide]; NSString* key = [NSString stringWithFormat:@"%d",code]; NSString* name = [dicTypeName objectForKey:key]; [self actionCustomNavBtn:btnRigth nrlImage:@"" htlImage:@"0" title:name]; //重新綁定列表顯示內容 __weak typeof (self) wSelf = self; curPage = 1; [self getData:^{ __strong typeof (wSelf) sSelf = wSelf; sSelf->listNew = nil; }];}
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