UIPickerView 繼承了UIView 沒有繼承UIControl? UIPickerView的時間處理由其委托對象完成
使用Component標明列 Row標明列中單個元素
numberOfCompinents：獲取UIPickerView 指定列中包含的列表項的數量。該屬性只讀
showsSelectionIndicator: 是否顯示UIPV中的選中標記（以高亮背景作為選中標記)
numberOfRowsInComponent: 獲取UIPV包含的列數量
rowSizeForCompinent:獲取UIPV包含的指定列中列表項的大小。該方法返回一個CGSize對象
selectRow：inComponent:animated:該方法設置選中該UIPV中指定列的特定列表項 最后一個 是否使用動畫
selectRowInCompinent:返回該UIPickerView指定列中悲酸中的列表項
viewForRow:forComponent:返回該UIPV指定列的列表項所使用的UIView控件
UIDatePicker只是負責該空間的通用行為，而該空間包含多少列，格列包含多少個列表項則有UIPickerViewDataSource對象負責
開發者必須weiUIPickerView設置UIPickerViewDataSource對象，并實現兩種方法：
numberOFComponentsInPickerView:該UIPickerView將通過該方法來判斷應該包含多少列
pickerView:numBerOfRowsInCompont:判斷指定列包含多少個列表項
UIPickerView需要控制各列額寬度，以及各列中列表項的大小和外觀，或程序需要為UIPicker的選中事件提供相應，都需要為UIPickerView設置UIPVDelegate委托對象，并根據需要實現該委托對象中的如下方法
-pickerView:rowHeightForCompinent:該方法返回的CGFloatz值將作為該UIPV控件中指定列中列表項的高度
-pickerView:widthForComponent:寬
-~titleForRow；forComponent：指定列的列表項的文本標題
~viewForRow:forComponent:reusingView：返回的UIPV控件中指定列的指定列表項
UIPV-InterfaceBuilder -ShowsSelectionIndicator 是否顯示UIPV中選中標記（高亮背景)
10.12.1 單列選擇器
- (void)viewDidLoad {
[super viewDidLoad];
self.books=[NSArray arrayWithObjects:@"第一項",@"第二項",@"第三項", nil];
self.pickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(0, 20, 400, 500)];
self.pickerView.dataSource=self;
self.pickerView.delegate=self;
[self.view addSubview:self.pickerView];
// Do any additional setup after loading the view, typically from a nib.
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return self.books.count;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
//根據row參數返回books中的元素，row參數代表列表項的編號
//因此該方法表示第幾個列表項，就使用books中的第幾個元素
return [self.books objectAtIndex:row];
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
//使用一個UIAlertView來系那是用戶選中的列表項
UIAlertView* alert=[[UIAlertView alloc]
initWithTitle:@"提示" message:[NSString stringWithFormat: @"你選中的圖書是：%@",[self.books objectAtIndex:row]] delegate:nil cancelButtonTitle:@"確定" otherButtonTitles: nil];
[alert show];
}
10.12.2多項選擇器
- (void)viewDidLoad {
[super viewDidLoad];
_initState=0;
self.books=[NSArray arrayWithObjects:@"詩集1",@"詩集2",@"詩集3", nil];
self.haiMingWei=[NSArray arrayWithObjects:@"這里的黎明靜悄悄",@"老人與海", nil];
self.shaShiBiYa=[NSArray arrayWithObjects:@"十四行詩集",@"慕克白",@"哈姆萊特",@"羅密歐與朱麗葉", nil];
//? ? self.dict=[NSDictionary dictionaryWithObjectsAndKeys:self.books,@"葉慈",
// ? ? ? ? ? ? ? self.haiMingWei,@"海明威",
// ? ? ? ? ? ? ? self.shaShiBiYa,@"羅密歐與朱麗葉",nil];
self.author=[NSArray arrayWithObjects:@"海明威",@"莎士比亞",@"葉慈", nil];
self.pickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(0, 20, 400, 500)];
self.pickerView.dataSource=self;
self.pickerView.delegate=self;
self.i=0;
[self.view addSubview:self.pickerView];
// Do any additional setup after loading the view, typically from a nib.
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 2;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
if (component==0) {
return? self.author.count;
}
if ([self.pickerView selectedRowInComponent:0]==0) {
return? self.haiMingWei.count;
}else? if ([self.pickerView selectedRowInComponent:0]==1) {
return? self.shaShiBiYa.count;
}else
return self.books.count;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
//根據row參數返回books中的元素，row參數代表列表項的編號
//因此該方法表示第幾個列表項，就使用books中的第幾個元素
if (component==0) {
return? self.author[row];
}
switch ([self.pickerView selectedRowInComponent:0]) {
case 0:
return self.haiMingWei[row];
break;
case 1:
return self.shaShiBiYa[row];
break;
case? 2:
return? self.books[row];
break;
default:
return self.haiMingWei[row];
break;
}
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
//使用一個UIAlertView來系那是用戶選中的列表項
if (component==0) {
[self.pickerView selectRow:row inComponent:component animated:YES];
[self.pickerView reloadComponent:1];
}
}
實現了單列巡回滾動的UIPickerView
.h——————————————————————
@property (nonatomic) UIPickerView* pickerView;
@property (nonatomic) UIImage* lose;
@property (nonatomic) UIImage* win;
@property (nonatomic) NSMutableArray* images;
@property (nonatomic) UIImageView* view;
@property (nonatomic) UIButton* start;
@property (nonatomic) UIImageView* image;
@property (nonatomic,strong) NSArray* imagesTemp;//原圖片序列
@property (nonatomic,strong) NSMutableArray* comArr;//控制每一列的圖片，每一序列是picker一列的所有圖片集合
.m——————————————————————
- (void)viewDidLoad {
[super viewDidLoad];
UIImage* dog=[UIImage imageNamed:@"./images/dog.png"];
UIImage* duck=[UIImage imageNamed:@"./images/duck.png"];
UIImage* elephant=[UIImage imageNamed:@"./images/elephant.png"];
UIImage* frog=[UIImage imageNamed:@"./images/frog.png"];
UIImage* mouse=[UIImage imageNamed:@"./images/mouse.png"];
UIImage* rabbit=[UIImage imageNamed:@"./images/rabbit.png"];
self.lose=[UIImage imageNamed:@"./images/lose.jpg"];
self.win=[UIImage imageNamed:@"./images/win.gif"];
self.images=[NSMutableArray arrayWithObjects:dog,duck,
elephant,frog,mouse,rabbit, nil];
self.imagesTemp=[NSMutableArray arrayWithArray:self.images];
self.comArr=[NSMutableArray arrayWithObjects:
self.imagesTemp,
self.imagesTemp,
self.imagesTemp,
self.imagesTemp,
self.imagesTemp,
self.imagesTemp
,nil];
//加載輸贏結果的圖標顯示
self.image=[[UIImageView alloc]initWithFrame:CGRectMake(190, 330, 40, 40)];
[self.view addSubview:self.image];
//加載主體
self.pickerView=[[UIPickerView alloc]initWithFrame:
CGRectMake(20, 20, 380, 200)];
self.pickerView.dataSource=self;
self.pickerView.delegate=self;
self.pickerView.userInteractionEnabled=NO;
[self.view addSubview:self.pickerView];
//加載開始按鈕
self.start=[UIButton buttonWithType:UIButtonTypeRoundedRect];
self.start.frame=CGRectMake(200, 400, 40, 50);
[self.start setTitle:@"開始" forState:UIControlStateNormal];
[self.start addTarget:self action:@selector(clicked:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.start];
// Do any additional setup after loading the view, typically from a nib.
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 5;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return self.images.count;
}
#define kImageTag 1
-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
if (view.tag!=kImageTag) {
view=[[UIImageView alloc]initWithImage:[self.comArr[component] objectAtIndex:row]];
view.tag=kImageTag;
view.userInteractionEnabled=NO;
}
return view;
}
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{
return 40;
}
-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
return 40;
}
-(void)clicked:(id)sender{
self.start.enabled=NO;
self.image.image=nil;
NSMutableDictionary* result=[[NSMutableDictionary alloc]
initWithCapacity:6];
NSURL* winSoundUrl=[[NSBundle mainBundle]
URLForResource:@"crunch" withExtension:@"wav"];
for (int i=0; i<5;i++) {
NSUInteger selectedVal=arc4random()%self.images.count;
//為了選擇器列之間不會互相影響，新建一個數組
NSMutableArray* arr=[NSMutableArray arrayWithArray:self.imagesTemp];
for (int j=0; j
[arr setObject: self.imagesTemp[(selectedVal+j)%self.images.count]
atIndexedSubscript:(j+3)%self.imagesTemp.count];
}
//將重新歸序的數組放入到第i列的中，重新加載
[self.comArr setObject:arr atIndexedSubscript:i];
[self.pickerView reloadComponent:i];
[self.pickerView selectRow:3 inComponent:i animated:YES];
//在result中已經為該隨機數記錄了出現次數
if ([result objectForKey:[NSNumber numberWithInt:selectedVal]]) {
//獲取result中該隨機數的出現次數
NSUInteger newCount=[[result objectForKey:
[NSNumber numberWithInt:selectedVal] ] integerValue];
//將result中該隨機數的出現次數+1
[result setObject:[NSNumber numberWithInt:(newCount+1)] forKey:[NSNumber numberWithInt:selectedVal]];
}else
{
//使用result記錄該隨機數的出現次數為1
[result setObject:[NSNumber numberWithInt:1] forKey:[NSNumber numberWithInt:selectedVal]];
}
//使用該變量記錄隨機數的最大出現次數
NSUInteger maxOccurs=1;
for (NSNumber* num in [result allKeys] ) {
//只要任何隨機數的出現次數大于maxOccurs
if ([[result objectForKey:num]integerValue]>maxOccurs) {
//使用maxOccurs保存該隨機數的出現次數
maxOccurs=[[result objectForKey:num] integerValue];
}
}
//如果某個隨機數的出現次數大于或等于3（既是界面出現了三個相同圖案
if (maxOccurs>=3) {
//如果贏了延遲0.5秒執行showWin方法，顯示結果
[self performSelector:@selector(showWin) withObject:nil afterDelay:0.5];
}else{
//
[self performSelector:@selector(showLose) withObject:nil afterDelay:0.5];
}
}
}
-(void)showWin{
self.image.image=self.win;
self.start.enabled=YES;
}
-(void)showLose{
self.image.image=self.lose;
self.start.enabled=YES;
}
//當運行后，圖片不顯示，則可能初始化加載的圖片為空，可能圖片路徑有問題，或者沒有加入到項目中
加入項目
1.使用addfileTo ? xCode左側右鍵
2.在target-BuildPhases-CompileSources 中加入圖片文件
