本期帶來 tableview 的編輯模式，多選刪除、全選刪除,統計選中刪除數功能。
實現下面代理方法可以調用系統的選擇 cell 左邊的藍色選中圖標，當然必須是tableView.editing = YES;
-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewCellEditingStyleDelete | UITableViewCellEditingStyleInsert;
}
刪除 cell 用一個中介數組變量來進行統計要刪除的 cell
選擇 cell 用方法
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionBottom];
注意要用UITableViewScrollPositionBottom，這樣才能從頭選到尾，不會出現只選擇屏幕顯示的區域
具體代碼
#import "ViewController.h"
#import "Masonry.h"
#import "UIButton+Extention.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
@property (weak, nonatomic) UITableView *tableView;
@property (weak, nonatomic) UIButton *selectedBtn;
@property (weak, nonatomic) UIButton *deleteBtn;
@property (weak, nonatomic) UIImageView *editView;
@property (strong, nonatomic) NSMutableArray *dataArr;
@property (strong, nonatomic) NSMutableArray *deleteArr;
@property (assign, nonatomic) NSInteger deleteNum;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.deleteArr = [[NSMutableArray alloc]init];
UITableView *tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height - 70)];
[self.view addSubview:tableView];
self.tableView = tableView;
tableView.delegate = self;
tableView.dataSource = self;
tableView.editing = YES;
// 編輯區域
UIImageView *editView = [[UIImageView alloc]init];
[self.view addSubview:editView];
self.editView = editView;
editView.userInteractionEnabled = YES;
// editView.hidden = YES;
editView.image = [UIImage imageNamed:@"MyLivingBtnBackground.png"];
[editView mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.right.bottom.equalTo(self.view);
make.height.equalTo(@65);
}];
// 全選
UIButton *selectedBtn = [UIButton buttonWithImage:@"AllSelectedBtn" title:@"全選" target:self action:@selector(selectedBtnClick)];
[editView addSubview:selectedBtn];
self.selectedBtn = selectedBtn;
[selectedBtn setTitle:@"取消全選" forState:UIControlStateSelected];
[selectedBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(140, 45));
make.centerY.equalTo(editView);
make.centerX.equalTo(@-80);
}];
// 刪除
UIButton *deleteBtn = [UIButton buttonWithImage:@"delete_btn" title:@"刪除(0)" target:self action:@selector(deleteBtnClick)];
[editView addSubview:deleteBtn];
self.deleteBtn = deleteBtn;
[deleteBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(140, 45));
make.centerY.equalTo(editView);
make.centerX.equalTo(@80);
}];
}
#pragma mark - 全選按鈕被點擊
- (void)selectedBtnClick {
if (!self.selectedBtn.selected) {
self.selectedBtn.selected = YES;
for (int i = 0; i < self.dataArr.count; i++) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionBottom];
}
[self.deleteArr addObjectsFromArray:self.dataArr];
self.deleteNum = self.dataArr.count;
[self.deleteBtn setTitle:[NSString stringWithFormat:@"刪除(%lu)",self.deleteNum] forState:UIControlStateNormal];
}else{
self.selectedBtn.selected = NO;
[self.deleteArr removeAllObjects];
for (int i = 0; i < self.dataArr.count; i++) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];
// cell.selected = NO;
}
self.deleteNum = 0;
[self.deleteBtn setTitle:[NSString stringWithFormat:@"刪除(%lu)",self.deleteNum] forState:UIControlStateNormal];
}
}
#pragma mark - 刪除按鈕
- (void)deleteBtnClick {
if (self.tableView.editing) {
//刪除
[self.dataArr removeObjectsInArray:self.deleteArr];
[self.tableView reloadData];
self.deleteNum = 0;
[self.deleteBtn setTitle:[NSString stringWithFormat:@"刪除(%lu)",self.deleteNum] forState:UIControlStateNormal];
self.selectedBtn.selected = NO;
// 你的網絡請求
}
}
#pragma mark - DataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.dataArr.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellID = @"cellID";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
}
cell.textLabel.text = [NSString stringWithFormat:@"%@",self.dataArr[indexPath.row]];
return cell;
}
#pragma mark - tableViewDelegate
-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewCellEditingStyleDelete | UITableViewCellEditingStyleInsert;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self.deleteArr addObject:[self.dataArr objectAtIndex:indexPath.row]];
self.deleteNum += 1;
[self.deleteBtn setTitle:[NSString stringWithFormat:@"刪除(%lu)",self.deleteNum] forState:UIControlStateNormal];
}
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {
[self.deleteArr removeObject:[self.dataArr objectAtIndex:indexPath.row]];
self.deleteNum -= 1;
[self.deleteBtn setTitle:[NSString stringWithFormat:@"刪除(%lu)",self.deleteNum] forState:UIControlStateNormal];
}
#pragma mark - 懶加載
- (NSMutableArray *)dataArr {
if (_dataArr == nil) {
_dataArr = [[NSMutableArray alloc]init];
for (int i = 0; i < 100; ++i) {
[_dataArr addObject:@(i)];
}
}
return _dataArr;
}
@end
如果不想用系統自帶的藍色圓圈選中樣式，想要修改為自定義的選中樣式，可以看我的這篇博文http://www.lxweimin.com/p/678da944f6fb
