上个月，我独立开发的 融易点 已成功上架了，是一款为高校学生金融知识学习做服务的app，目前是1.0版本。那里面逻辑比较复杂的界面，就是做题界面，有单选、多选题、判断题、简答题等等，类似的demo，很少，我也参考了一些，学到了不少经验，值得写下来分享，这个项目第一版功能相对简单，所以我还是采用了MVC的架构，我们先看看效果，如下所示：
1.gif
简单说说实现的界面层次结构：
ViewController中，主要的有：self.view->UICollectionView->UITableView
当然了，界面上还有UIImageView、UIProgressView、UIButton，这些是次要的。
接下来，开始具体的实现过程，首先，自定义选项的cell，我使用的是xib，同时创建HomePowerExamModel，如图所示：
image.png
image.png
image.png
创建3个tableView，我把他们命名为：HomeBaseExamTV，HomeSingleTV，HomeMultiTV，让后面两个继承于第一个，先看看HomeBaseExamTV的代码：
#import
@class HomePowerExamModel;
@interface HomeBaseExamTV : UITableView
@property (nonatomic, strong) HomePowerExamModel * ExModel;
@property(nonatomic,strong) NSArray *answerList;
@property(nonatomic,strong) NSArray *questionList;
// 答案字典
@property(nonatomic,copy) NSDictionary *answer;
// 默认选中的答案
@property (nonatomic,copy) NSString *tempAnswer;
/**
通用设置 子类实现必须调用super
@param model 数据模型
@param index 第几题
*/
- (void)config:(HomePowerExamModel *)model index:(NSInteger)index;
@end
#import "HomeBaseExamTV.h"
#import "HomePowerExamModel.h"
@interface HomeBaseExamTV()
@end
@implementation HomeBaseExamTV
- (NSArray *)answerList{
if (!_answerList) {
_answerList = @[@"A",@"B",@"C",@"D",@"E"];
}
return _answerList;
}
- (NSArray *)questionList{
if (!_questionList) {
_questionList = @[NONullString(_ExModel.QB_A),NONullString(_ExModel.QB_B),NONullString(_ExModel.QB_C),NONullString(_ExModel.QB_D),NONullString(_ExModel.QB_E)];
}
return _questionList;
}
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.separatorStyle = UITableViewCellSeparatorStyleNone;
}
return self;
}
- (void)config:(HomePowerExamModel *)model index:(NSInteger)index
{
self.ExModel = model;
UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.width, 0)];
UILabel * titleLb;
/*题目文字*/
if (iphoneSE) {
titleLb = [[UILabel alloc] initWithFrame:CGRectMake(10, 20, self.width-15, 0)];
} else if (iphone7)
{
titleLb = [[UILabel alloc] initWithFrame:CGRectMake(10, 25, self.width-15, 0)];
} else
{
titleLb = [[UILabel alloc] initWithFrame:CGRectMake(10, 35, self.width-20, 0)];
}
titleLb.numberOfLines = 0;
titleLb.text = [NSString stringWithFormat:@"%zd、%@",index+1,model.QB_Description];
if (iphoneSE) {
titleLb.font = [UIFont systemFontOfSize:14];
} else
{
titleLb.font = [UIFont systemFontOfSize:15];
}
[titleLb sizeToFit];
titleLb.textColor = [UIColor colorWithHexColorString:@"#3c4a55" alpha:1.0];
titleLb.textAlignment = NSTextAlignmentNatural;
[headerView addSubview:titleLb];
headerView.height = titleLb.bottom + 10;
self.tableHeaderView = headerView;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
return nil;
}
接下来看看HomeSingleTV的代码，由于判断题也属于单选题，不一样的是，单选题最多有5个选项，判断题只有两个选项，后台有返回一个type判断题型，所以共用一个tableView，如下代码所示：
#import "HomeBaseExamTV.h"
@interface HomeSingleTV : HomeBaseExamTV
@end
#import "HomeSingleTV.h"
#import "HomeSelectionCell.h"
#import "HomePowerExamModel.h"
@interface HomeSingleTV()
@property (nonatomic, strong) HomePowerExamModel *model;
@property (nonatomic,strong) NSMutableDictionary *rowHeightDic;
@property(nonatomic,assign) NSInteger selected;
@end
@implementation HomeSingleTV
- (NSMutableDictionary *)rowHeightDic
{
if (!_rowHeightDic) {
_rowHeightDic = [NSMutableDictionary dictionary];
}
return _rowHeightDic;
}
- (NSDictionary *)answer{
if (self.selected != -1)
{
return @{@"QuestionBID":@([self.model.QuestionBId intValue]),@"answer":self.answerList[_selected]};
} else
{
return @{@"QuestionBID":@([self.model.QuestionBId intValue]),@"answer":@""};
}
}
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.selected = -1;
[self registerNib:[UINib nibWithNibName:@"HomeSelectionCell" bundle:nil] forCellReuseIdentifier:@"HomeSelectionCell"];
self.backgroundColor = [UIColor clearColor];
self.bounces = NO;
}
return self;
}
- (void)config:(HomePowerExamModel *)model index:(NSInteger)index{
[super config:model index:index];//调用父类方法 设置通用设置
self.model = model;
self.delegate = self;
self.dataSource = self;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if ([self.model.QB_Type isEqualToString:@"3"]) {
return 2;
}
else
{
return self.questionList.count;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
HomeSelectionCell * cell = [tableView dequeueReusableCellWithIdentifier:@"HomeSelectionCell"];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.contentLb.text = [NSString stringWithFormat:@"%@",self.questionList[indexPath.row]];
cell.contentLb.textColor = [UIColor colorWithHexColorString:@"#666666" alpha:1.0];
cell.contentLb.font = [UIFont systemFontOfSize:14];
cell.backgroundColor = [UIColor clearColor];
NSArray * normalImgName = @[@"A1",@"B1",@"C1",@"D1",@"E1"];
NSArray * selectImgName = @[@"A2",@"B2",@"C2",@"D2",@"E2"];
[cell.selectBtn setImage:ImageNamed(normalImgName[indexPath.row]) forState:UIControlStateNormal];
[cell.selectBtn setImage:ImageNamed(selectImgName[indexPath.row]) forState:UIControlStateSelected];
if ([cell.contentLb.text isEqualToString:@""]) {
cell.selectBtn.hidden = YES;
} else
{
cell.selectBtn.hidden = NO;
}
cell.backgroundColor = [UIColor clearColor];
if (indexPath.row == self.selected)
{
cell.selectBtn.selected = YES;
} else
{
cell.selectBtn.selected = NO;
}
cell.selectBtn.tag = indexPath.row;
[cell.selectBtn addTarget:self action:@selector(selectBtnClick:) forControlEvents:UIControlEventTouchUpInside];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
CGFloat height = [self getHeightWithStr:cell.contentLb.text];
if (iphoneSE)
{
cell.bgView.frame = CGRectMake(0, 0, 270, height);
cell.selectBtn.frame = CGRectMake(10, 2, 55, height);
cell.contentLb.frame = CGRectMake(50, 2, 225, height);
}
else if (iphone7)
{
cell.bgView.frame = CGRectMake(0, 0, 275, height);
cell.selectBtn.frame = CGRectMake(10, 2, 55, height);
cell.contentLb.frame = CGRectMake(50, 2, 225, height);
}
else
{
cell.bgView.frame = CGRectMake(0, 0, 275, height);
cell.selectBtn.frame = CGRectMake(15, 2, 55, height);
cell.contentLb.frame = CGRectMake(50, 2, 225, height);
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.selected = indexPath.row;
[self reloadData];
}
/*根据返回的选项文字长度动态计算cell高度*/
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSNumber *number = [self.rowHeightDic objectForKey:@(indexPath.row).description];
if (number) {
if (iphoneSE) {
return number.floatValue;
}
else
{
return number.floatValue + 10;
}
}else{
CGFloat height = [self getHeightWithStr:self.questionList[indexPath.row]];
[self.rowHeightDic setValue:[NSNumber numberWithFloat:height] forKey:@(indexPath.row).description];
return height;
}
}
- (CGFloat)getHeightWithStr:(NSString *)str{
return [self calculateStringHeight:str width:SCREEN_WIDTH - 10 -18 -5 -10 fontSize:17] + 15;
}
// 计算文字高度
- (CGFloat)calculateStringHeight:(NSString *)str width:(CGFloat)width fontSize:(CGFloat)size{
return [str boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:size]} context:nil].size.height;
}
/*保存已答过的答案*/
- (void)setTempAnswer:(NSString *)tempAnswer{
if (tempAnswer.length == 0)
return;
_selected = [self.answerList indexOfObject:tempAnswer];
[self reloadData];
}
/*单选点击选项*/
- (void)selectBtnClick:(UIButton *)btn
{
self.selected = btn.tag;
[self reloadData];
}
@end
接着是HomeMultiTV的代码，多选题由于有多种组合，所以需要做两种处理：一、对多选题答案进行快速排序，我是用数组来保存答案，所以对数组进行快速排序；
二、多选题在没有提交答案的时候，选项是可以重新选，通过按钮来实现。
完整代码如下：
#import "HomeBaseExamTV.h"
@interface HomeMultiTV : HomeBaseExamTV
@end
#import "HomeMultiTV.h"
#import "HomeSelectionCell.h"
#import "HomePowerExamModel.h"
@interface HomeMultiTV ()
@property (nonatomic,strong) NSMutableDictionary *rowHeightDic;
@property(nonatomic,strong) NSMutableArray *selectedArray;
@property (nonatomic, strong) NSArray * multiAnswerList;
@end
@implementation HomeMultiTV
- (NSMutableDictionary *)rowHeightDic{
if (!_rowHeightDic) {
_rowHeightDic = [NSMutableDictionary dictionary];
}
return _rowHeightDic;
}
- (NSArray *)multiAnswerList
{
if (!_multiAnswerList) {
_multiAnswerList = @[@"A,",@"B,",@"C,",@"D,",@"E,"];
}
return _multiAnswerList;
}
/*后台对多选题的答案要求按照ABCDE这样的顺序，所以进行排序*/
- (NSDictionary *)answer{
NSString *answer = @"";
NSString *Answer = @"";
/*给数组快速排序*/
[self.selectedArray sortUsingSelector:@selector(compare:)];
for (NSNumber *number in self.selectedArray) {
Answer = [Answer stringByAppendingString:self.multiAnswerList[number.intValue]];
}
if (Answer.length > 0) {
answer = [Answer substringToIndex:[Answer length]-1];
}
if (answer.length>0)
{
return @{@"QuestionBID":@([self.ExModel.QuestionBId intValue]),@"answer":answer};
} else
{
return @{@"QuestionBID":@([self.ExModel.QuestionBId intValue]),@"answer":@""};
}
}
- (NSMutableArray *)selectedArray{
if (!_selectedArray) {
_selectedArray = [NSMutableArray array];
}
return _selectedArray;
}
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self registerNib:[UINib nibWithNibName:@"HomeSelectionCell" bundle:nil] forCellReuseIdentifier:@"HomeSelectionCell"];
self.backgroundColor = [UIColor clearColor];
self.bounces = NO;
}
return self;
}
- (void)config:(HomePowerExamModel *)model index:(int)index
{
[super config:model index:index];
self.delegate = self;
self.dataSource = self;
}
/*保存答案*/
- (void)setTempAnswer:(NSString *)tempAnswer{
if (tempAnswer.length == 0)
return;
for(int i =0; i < [tempAnswer length]; i++)
{
NSString *str = [tempAnswer substringWithRange:NSMakeRange(i, 1)];
if (![str isEqualToString:@","]) {
NSInteger index = [self.answerList indexOfObject:str];
if (![self.selectedArray containsObject:@(index)])
{
[self.selectedArray addObject:@(index)];
}
}
}
[self reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.questionList.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
HomeSelectionCell * cell = [tableView dequeueReusableCellWithIdentifier:@"HomeSelectionCell"];
cell.contentLb.text = [NSString stringWithFormat:@"%@",self.questionList[indexPath.row]];
cell.contentLb.font = [UIFont systemFontOfSize:14];
cell.contentLb.textColor = [UIColor colorWithHexColorString:@"#666666" alpha:1.0];
NSArray * normalImgName = @[@"A1",@"B1",@"C1",@"D1",@"E1"];
NSArray * selectImgName = @[@"A2",@"B2",@"C2",@"D2",@"E2"];
[cell.selectBtn setImage:ImageNamed(normalImgName[indexPath.row]) forState:UIControlStateNormal];
[cell.selectBtn setImage:ImageNamed(selectImgName[indexPath.row]) forState:UIControlStateSelected];
if ([cell.contentLb.text isEqualToString:@""]) {
cell.selectBtn.hidden = YES;
}
else
{
cell.selectBtn.hidden = NO;
}
if ([self.selectedArray containsObject:@(indexPath.row)])
{
cell.selectBtn.selected = YES;
} else
{
cell.selectBtn.selected = NO;
}
cell.backgroundColor = [UIColor clearColor];
cell.selectBtn.tag = indexPath.row;
[cell.selectBtn addTarget:self action:@selector(selectBtnClick:) forControlEvents:UIControlEventTouchUpInside];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
CGFloat height = [self _getHeightWithStr:cell.contentLb.text];
if (iphoneSE)
{
cell.bgView.frame = CGRectMake(0, 0, 270, height);
cell.selectBtn.frame = CGRectMake(10, 2, 55, height);
cell.contentLb.frame = CGRectMake(50, 2, 225, height);
}
else if (iphone7)
{
cell.bgView.frame = CGRectMake(0, 0, 275, height);
cell.selectBtn.frame = CGRectMake(10, 2, 55, height);
cell.contentLb.frame = CGRectMake(50, 2, 225, height);
}
else
{
cell.bgView.frame = CGRectMake(0, 0, 275, height);
cell.selectBtn.frame = CGRectMake(15, 2, 55, height);
cell.contentLb.frame = CGRectMake(50, 2, 225, height);
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([self.selectedArray containsObject:@(indexPath.row)]) {
[self.selectedArray removeObject:@(indexPath.row)];
}else{
[self.selectedArray addObject:@(indexPath.row)];
}
[self reloadData];
}
/*动态计算高度*/
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
NSNumber *number = [self.rowHeightDic objectForKey:@(indexPath.row).description];
if (number)
{
if (iphoneSE) {
return number.floatValue;
}
else
{
return number.floatValue + 10;
}
}else{
CGFloat height = [self _getHeightWithStr:self.questionList[indexPath.row]];
[self.rowHeightDic setValue:
[NSNumber numberWithFloat:height] forKey:@(indexPath.row).description];
return height;
}
}
- (CGFloat)_getHeightWithStr:(NSString *)str{
return [self calculateStringHeight:str width:SCREEN_WIDTH - 10 -18 -5 -10 fontSize:17] + 15;
}
// 计算文字高度
- (CGFloat)calculateStringHeight:(NSString *)str width:(CGFloat)width fontSize:(CGFloat)size{
return [str boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:
NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:
@{NSFontAttributeName:[UIFont systemFontOfSize:size]} context:nil].size.height;
}
- (void)selectBtnClick:(UIButton *)btn
{
if ([self.selectedArray containsObject:@(btn.tag)]) {
[self.selectedArray removeObject:@(btn.tag)];
}
else
{
[self.selectedArray addObject:@(btn.tag)];
}
[self reloadData];
}
model和 View的代码已经实现，最后，看看Controller中的主要代码实现，首先，创建CollectionView：
- (void)setupCollectionView
{
UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc]init];
flowLayout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);
flowLayout.minimumInteritemSpacing = 0;
flowLayout.minimumLineSpacing = 0;
if (iphoneSE) {
flowLayout.itemSize = CGSizeMake(260, SCREEN_HEIGHT-64);
}
else if (iphone7)
{
flowLayout.itemSize = CGSizeMake(306, SCREEN_HEIGHT-64);
} else
{
flowLayout.itemSize = CGSizeMake(337, SCREEN_HEIGHT-64);
}
//确定水平滑动方向
[flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
if (iphoneSE) {
self.collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64, 260, SCREEN_HEIGHT-150) collectionViewLayout:flowLayout];
self.collectionView.center = CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT/2);
} else if (iphone7)
{
self.collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64, 306, SCREEN_HEIGHT-180) collectionViewLayout:flowLayout];
self.collectionView.center = CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT/2);
} else
{
self.collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64, 337, SCREEN_HEIGHT-200) collectionViewLayout:flowLayout];
self.collectionView.center = CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT/2);
}
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
self.collectionView.pagingEnabled = YES;
self.collectionView.scrollEnabled = NO;
self.collectionView.showsHorizontalScrollIndicator = NO;
self.collectionView.showsVerticalScrollIndicator = NO;
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"UICollectionViewCell"];
self.collectionView.backgroundColor = [UIColor clearColor];
[self.view addSubview:self.collectionView];
// 首次调用
self.collectionView.contentOffset = CGPointMake(self.currentIndex*SCREEN_WIDTH, 0);
}
紧接着，实现CollectionView的代理方法和数据源方法：
#pragma mark -- UICollectionViewDataSource,UICollectionViewDelegateFlowLayout
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return self.dataSource.count;
}
- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"UICollectionViewCell" forIndexPath:indexPath];
[cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
self.ExamModel = self.dataSource[indexPath.row];
HomeBaseExamTV * baseTv = nil;
//题型 1单选 2多选 3判断
if ([self.ExamModel.QB_Type isEqualToString:@"1"])
{
baseTv = [[HomeSingleTV alloc] initWithFrame:CGRectZero];
self.topicTypeLb.text = @"单选题";
}
else if ([self.ExamModel.QB_Type isEqualToString:@"2"])
{
baseTv = [[HomeMultiTV alloc] initWithFrame:CGRectZero];
self.topicTypeLb.text = @"多选题";
}
else if ([self.ExamModel.QB_Type isEqualToString:@"3"])
{
baseTv = [[HomeSingleTV alloc] initWithFrame:CGRectZero];
self.topicTypeLb.text = @"判断题";
}
if (iphoneSE) {
baseTv.frame = CGRectMake(0, 140, 250, self.collectionView.height-64);
} else if (iphone7)
{
baseTv.frame = CGRectMake(0, 170, 306, self.collectionView.height-64);
} else
{
baseTv.frame = CGRectMake(0, 170, 337, self.collectionView.height-64);
}
[cell.contentView addSubview:baseTv];
/*1表示做过了，看题目*/
if(self.doneType == 1)
{
[baseTv config:self.ExamModel index:indexPath.item];
baseTv.tempAnswer = self.ExamModel.userAnswer;
} else
{
[baseTv config:self.ExamModel index:indexPath.item];
baseTv.tempAnswer = self.ExamModel.userAnswer;
}
return cell;
}
由于做题界面是可以返回上一道题的，所以需要保存当前题目的答案，用到的方法如下：
//单选题
/*保存已答过的答案*/
- (void)setTempAnswer:(NSString *)tempAnswer{
if (tempAnswer.length == 0)
return;
_selected = [self.answerList indexOfObject:tempAnswer];
[self reloadData];
}
//多选题
/*保存答案*/
- (void)setTempAnswer:(NSString *)tempAnswer{
if (tempAnswer.length == 0)
return;
for(int i =0; i < [tempAnswer length]; i++)
{
NSString *str = [tempAnswer substringWithRange:NSMakeRange(i, 1)];
if (![str isEqualToString:@","]) {
NSInteger index = [self.answerList indexOfObject:str];
if (![self.selectedArray containsObject:@(index)])
{
[self.selectedArray addObject:@(index)];
}
}
}
[self reloadData];
}
到这里，做题界面就完成了，剩下的就是一些逻辑细节功能的处理，有几个功能实现，我也写下来分享，都是最简单直接的方式，可以直接用。
第一、时分秒计时。
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self regularTime];
}
- (void)regularTime
{
__weak typeof(self)weakSelf = self;
/*计时秒数*/
secondValue = 0;
timer = [NSTimer timerWithTimeInterval:1.0f block:^{
[weakSelf timerAction];
} repeats:YES];
//计算时分秒
NSString *str_hour = [NSString stringWithFormat:@"%02d",secondValue/3600];//时
NSString *str_minute = [NSString stringWithFormat:@"%02d",(secondValue%3600)/60];//分
NSString *str_second = [NSString stringWithFormat:@"%02d",secondValue%60];//秒
NSString *format_time = [NSString stringWithFormat:@"%@:%@:%@",str_hour,str_minute,str_second];
NSLog(@"time:%@",format_time);
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}
- (void)timerAction
{
/*正计时*/
secondValue++;
NSString *str_hour = [NSString stringWithFormat:@"%02d",secondValue/3600];
NSString *str_minute = [NSString stringWithFormat:@"%02d",(secondValue%3600)/60];
NSString *str_second = [NSString stringWithFormat:@"%02d",secondValue%60];
NSString *format_time = [NSString stringWithFormat:@"%@:%@:%@",str_hour,str_minute,str_second];
self.currentTimeLb.text = [NSString stringWithFormat:@"%@",format_time];
}
- (void)dealloc
{
NSLog(@"%s",__func__);
}
第二、防止暴力点击。点确定按钮提交答案时，为了防止用户暴力点击，所以，点击间隔时间小于1秒的，无效。
- (IBAction)submitBtnClick:(UIButton *)btn
{
DLog(@" %s ",__FUNCTION__);
[[self class] cancelPreviousPerformRequestsWithTarget:self
selector:@selector(handleEvent:)
object:btn];
[self performSelector:@selector(handleEvent:) withObject:btn afterDelay:1.0];
}
- (void)handleEvent:(UIButton *)btn
{}
第三、获取当前题目答案。点击确认提交答案的同时，保存当前题目答案，然后滑动到下一题，我再滑回上一道题的时候，依然可以展示上一道题的答案，self.currentIndex是指当前题目的页码。
#pragma mark - scrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSInteger index = (scrollView.contentOffset.x+scrollView.frame.size.width*0.5)/scrollView.frame.size.width;
if (index != self.currentIndex || index == self.defautIndex) {//页面改变了
// 这里设置成-1 为了index == self.defautIndex 失效
self.defautIndex = -1;
[self updateAnswers];
self.currentIndex = index;
DLog(@"index:%zd",index);
}
}
#pragma mark 更新暂存的答案
- (void)updateAnswers{
for (UICollectionViewCell *cell in [self.collectionView visibleCells]) {
HomeBaseExamTV *tableView = cell.contentView.subviews[0];
[self.dataSource enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(HomePowerExamModel *model, NSUInteger idx, BOOL * _Nonnull stop) {
if (model.QuestionBId == [NSString stringWithFormat:@"%@",tableView.answer[@"QuestionBID"]] ) {
model.userAnswer = tableView.answer[@"answer"];
if ([model.QB_Type isEqualToString:@"3"] && ![model.userAnswer isEqualToString:@""]) {
if ([model.userAnswer isEqualToString:@"A"]) {
model.userAnswer = @"对";
} else
{
model.userAnswer = @"错";
}
}
DLog(@"答案：%@",model.userAnswer);
if (self.currentIndex == self.dataSource.count-1)
{
[self submitData:model.userAnswer Type:@"1"];
} else
{
[self submitData:model.userAnswer Type:@"0"];
}
}
}];
}
}
//如果是单选题，则对应的是这个方法
- (NSDictionary *)answer{
if (self.selected != -1)
{
return @{@"QuestionBID":@([self.model.QuestionBId intValue]),@"answer":self.answerList[_selected]};
} else
{
return @{@"QuestionBID":@([self.model.QuestionBId intValue]),@"answer":@""};
}
}
//如果是多选题，那answer对应的方法就是快速排序，就是前面MultiTV中的方法
- (NSDictionary *)answer{
NSString *answer = @"";
NSString *Answer = @"";
/*给数组快速排序*/
[self.selectedArray sortUsingSelector:@selector(compare:)];
for (NSNumber *number in self.selectedArray) {
Answer = [Answer stringByAppendingString:self.multiAnswerList[number.intValue]];
}
if (Answer.length > 0) {
answer = [Answer substringToIndex:[Answer length]-1];
}
if (answer.length>0)
{
return @{@"QuestionBID":@([self.ExModel.QuestionBId intValue]),@"answer":answer};
} else
{
return @{@"QuestionBID":@([self.ExModel.QuestionBId intValue]),@"answer":@""};
}
}
总结
app项目业务开发，更多是涉及到交互逻辑设计，会有很多细节，这些都是经验，对app开发人员来说，在实现的过程中会遇到很多bug，但踩过来了就是经验的提升，记录下来，除了分享，也是对自己的回顾，希望自己能够不断提升，一起加油。