最近项目上出现了这种需要在一个cell上多个button的处理问题以及自己在项目中遇到的重用的问题,这也是开发中比较常见的功能和出现的问题,遂在此记录.
1.主界面的布局.
- 布局
- 按钮的点击事件
2.多个button在tableViewCell上的处理.
- 布局
- 计算高度
- 按钮的点击事件
- 传递选中按钮
3.单个button在tableViewCell上的重用处理
- 布局
- 添加选中标记
- 按钮的点击事件
- 传递选中按钮
@property (nonatomic, copy)NSArray *addressArray;
@property (nonatomic, copy)NSArray *taskArray;
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 2;
}
重点是对cellForRowAtIndexPath方法进行布局
分成 section = 0和 section = 1来处理
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
switch (indexPath.section) {
case 0:
{
// 多个button布局
UITableViewCell *cell = [[UITableViewCell alloc] init];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
// 标题
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(25, 0, SCREEN_WIDTH/3, firstSectionHeight)];
titleLabel.text = @"Buttons";
titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:15];
titleLabel.textColor = [UIColor blackColor];
[cell addSubview:titleLabel];
// 内容
UILabel *contentLabel = [[UILabel alloc] initWithFrame:CGRectMake(contentToLeftWidth, 0, SCREEN_WIDTH*2/3, firstSectionHeight)];
contentLabel.font = [UIFont systemFontOfSize:15];
contentLabel.textColor = RGB(170, 170, 170, 0.75);
contentLabel.text = @"请选择多个button";
[cell addSubview:contentLabel];
// 选中人最多显示三排,多余的人通过上下拉动显示
UIScrollView *scrollView = [[UIScrollView alloc] init];
[cell addSubview:scrollView];
// 选中人的集合
NSArray *array = self.addressArray;
NSInteger lines = 0;
if (array.count%3 != 0) {
lines = array.count/3 + 1;
} else {
lines = array.count/3;
}
if (lines < 3) {
scrollView.frame = CGRectMake(contentToLeftWidth, 0, SCREEN_WIDTH - contentToLeftWidth, 33*lines);
} else {
scrollView.frame = CGRectMake(contentToLeftWidth, 0, SCREEN_WIDTH - contentToLeftWidth, 33*3);
}
scrollView.contentSize = CGSizeMake(SCREEN_WIDTH - contentToLeftWidth, 33*lines);
scrollView.bounces = NO;
// 选中人的集合
for (NSInteger i = 0; i < array.count; i++) {
UIView *subView = [[UIView alloc] initWithFrame:CGRectMake((scrollView.width/3)*(i%3), 33*(i/3), scrollView.width/3, 33)];
subView.backgroundColor = [UIColor whiteColor];
[scrollView addSubview:subView];
// 图标
UIImageView *iconView = [[UIImageView alloc] init];
iconView.image = [UIImage imageNamed:@"icon_people"];
[iconView sizeToFit];
iconView.frame = CGRectMake(5, (33 - iconView.height)/2, iconView.width, iconView.height);
[subView addSubview:iconView];
UILabel *contentLabel = [[UILabel alloc] initWithFrame:CGRectMake(iconView.right + 11, 0, subView.width - iconView.right - 11, subView.height)];
contentLabel.font = [UIFont systemFontOfSize:13];
contentLabel.text = array[i][@"PERSONNAME"];
contentLabel.textColor = RGB(134, 134, 134, 1);
[subView addSubview:contentLabel];
}
// 选入按钮
UIButton *addressButton = [[UIButton alloc] init];
if (scrollView.height == 0) {
addressButton.frame = CGRectMake(contentToLeftWidth, 0, SCREEN_WIDTH - contentToLeftWidth - contentToLeftWidth, firstSectionHeight);
} else {
addressButton.frame = CGRectMake(contentToLeftWidth, 0, SCREEN_WIDTH - contentToLeftWidth - contentToLeftWidth, scrollView.height);
}
[addressButton addTarget:self action:@selector(addressClick:) forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:addressButton];
return cell;
}
break;
case 1:
{
// 单个button的重用
TaskCell *cell = [tableView dequeueReusableCellWithIdentifier:taskIdentifier];
if (cell == nil) {
cell = [[TaskCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:taskIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
cell.task = self.taskArray[indexPath.row];
cell.imageButton.userInteractionEnabled = NO;
return cell;
}
break;
default:
{
return nil;
}
break;
}
}
对两个点击事件的处理
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
switch (indexPath.section) {
case 0:
{
if (!self.addressArray) {
return firstSectionHeight;
} else {
NSInteger lines = 0;
if (self.addressArray.count%3 != 0) {
lines = self.addressArray.count/3 + 1;
} else {
lines = self.addressArray.count/3;
}
if (lines < 3) {
return lines*3*firstSectionHeight/4;
} else {
return 3*3*firstSectionHeight/4;
}
}
}
break;
case 1:
{
return 65;
}
break;
default:
return 0;
break;
}
}
- (void)addressClick:(UIButton *)sender {
AddressViewController *addressViewController = [AddressViewController new];
addressViewController.title = @"选择多个button";
addressViewController.addressBlock = ^(NSArray *userArray) {
self.addressArray = userArray;
[self.tableView reloadData];
};
[self.navigationController pushViewController:addressViewController animated:YES];
}
// 因为之后要添加headerView的收起功能,所以直接添加的是手势
- (void)taskClick:(UITapGestureRecognizer *)sender{
TaskViewController *taskViewController = [TaskViewController new];
taskViewController.title = @"选择单个button处理";
taskViewController.taskBlock = ^(NSArray *taskArray) {
self.taskArray = taskArray;
[self.tableView reloadData];
};
[self.navigationController pushViewController:taskViewController animated:YES];
}
这里tableView可以用Grouped类型也可以用Plain类型
for循环创建button并设置好点击后颜色的变化
在赋值承载多个button的cell模型Address中来计算并返回高度
#import "Address.h"
static const CGFloat buttonHeight = 25;
@implementation Address
- (void)setValue:(id)value forUndefinedKey:(NSString *)key{
}
- (CGFloat)cellHeight {
NSInteger c = self.USERS.count/4;
NSInteger l = self.USERS.count%4;
CGFloat userButtonsViewHeight = 0;
if (l != 0) {
userButtonsViewHeight = (c + 1)*(buttonHeight + 10);
} else {
userButtonsViewHeight = c*(buttonHeight + 10);
}
// contentHeight = Item离cell顶部高度 + Item高度 + Item离button顶部高度 + buttonView的高度 + buttonView离cell底部高度;
CGFloat contentHeight = 13 + 13 + 8 + userButtonsViewHeight + 18;
return contentHeight;
}
在控制器AddressViewController返回高度
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
Address *address = self.addressModels[indexPath.row];
return address.cellHeight;
}
- (void)userButtonClick:(UIButton *)button {
NSInteger tag = button.tag - 100;
NSDictionary *userDic = self.userArray[tag];
BOOL selectSate = [self.selectStateArray[tag] integerValue];
button.selected = selectSate;
if (button.selected) {
button.backgroundColor = RGB(240, 240, 240, 1);// 未选中灰色
button.selected = NO;
[self.selectStateArray replaceObjectAtIndex:tag withObject:@"0"];
[self.addressDelegate deleteUserDicFromUsers:userDic];
} else {
button.backgroundColor = RGB(56, 173, 255, 1);// 选中蓝色
button.selected = YES;
[self.selectStateArray replaceObjectAtIndex:tag withObject:@"1"];
[self.addressDelegate addUserDicToUsers:userDic];
}
}
点击事件里面记录了点击button的状态并用self.selectStateArray保存起来,这里button修改选中背景颜色可以直接修改或者通过对button添加观察者实现,这里通过代理传递选中的人物到主界面显示
// 改变按钮高亮背景颜色
- (void)addObserver:(UIButton *)button {
[button addObserver:self forKeyPath:@"highlighted" options:NSKeyValueObservingOptionNew context:nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
UIButton *button = (UIButton *)object;
if ([keyPath isEqualToString:@"highlighted"]) {
if (button.highlighted) {
[button setBackgroundColor:RGB(56, 173, 255, 1)];
return;
}
[button setBackgroundColor:RGB(240, 240, 240, 1)];
}
}
在AddressViewController控制器中执行代理方法
// 添加用户
- (void)addUserDicToUsers:(NSDictionary *)userDic {
[self.selectedUserArray addObject:userDic];
}
// 删除用户
- (void)deleteUserDicFromUsers:(NSDictionary *)userDic {
[self.selectedUserArray removeObject:userDic];
}
// 确定按钮
- (void)confirmButtonClick:(UIButton *)sender {
self.addressBlock(self.selectedUserArray);
[self.navigationController popViewControllerAnimated:YES];
}
进行基本的布局即可
给在承载单个button的cell模型Task中添加isSelected属性
解决重用造成的按钮选中状态丢失的问题
@property (nonatomic, assign)BOOL isSelected;
- (void)imageButtonClick:(UIButton *)sender {
sender.selected = !sender.selected;
if (sender.selected) {
[self.relateDelegate addTaskToRecord:_task];
} else {
[self.relateDelegate deleteTaskToRecord:_task];
}
}
在TaskViewController控制器中执行代理方法
// 添加选择的任务
- (void)addTaskToRecord:(Task *)task {
task.isSelected = YES;
[self.taskModels replaceObjectAtIndex:task.indexPathRow withObject:task];
[self.tableView reloadData];
[self.selectedTaskArray addObject:task];
}
// 删除选择的任务
- (void)deleteTaskToRecord:(Task *)task {
task.isSelected = NO;
[self.tableView reloadData];
[self.selectedTaskArray removeObject:task];
}
// 确定按钮
- (void)confirmButtonClick:(UIButton *)sender {
self.taskBlock(self.selectedTaskArray);
[self.navigationController popViewControllerAnimated:YES];
}
附上Demo地址
有什么问题可以留言,共同学习~