使用控制器和視圖
Model 應用程序的核心 負責計算與創建一個虛擬世界，它不依靠View與Controller就能存在。(一個沒有外觀接口的應用程序)
Controller在Xcode通常是指View controller。可以把它想成一座Model跟View之間的橋梁。
View則是一個讓用戶可以與程序溝通的窗口，大部分情況下，View都是用來顯示Model提供的數據，除此之外也負責處理與用戶的互動。用戶都是透過View與應用程序間的互動，而Controller則負責捕捉互動訊息並傳送給Model。
使用UIAlertView顯示提示
UIAlertView *alertView = [ [ UIAlertView
alloc] initWithTitle:@"Title" message:@"Message" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK",nil];
[alertView show];
UIAlertView 有提供一個類型為UIAlertViewStyle的屬性
tyledef enum{
UIAlertViewStyleDefault = 0,//默認樣式
UIAlertViewStyleSecureTextInput,//這個樣式中，提示視圖會包含一個安全加密的文字欄位。
UIAlertViewStylePlainTextInput,//在這種樣式中，提示視圖會顯示一個可見的文字欄位，一般來說使用這種樣式來要求用戶輸入一些信息，例如電話號碼。
UIAlertViewStyleLoginAndPasswordInput//在這個樣式中，提示視圖會顯示兩個文本欄位，一個是可見的用戶名稱欄位，另一個是加密 密碼欄位。
}UIAlertViewStyle;
若希望從提示視圖得到用戶操作通知，就必須制定一個委托對象，委托對象符合UIAlertViewDelegate協定。
alertView：clickedButtonAtIndex 這個方法可以得到用戶在提示視圖上所按下的按鈕。
-(NSString *)yesButtonTitle{
return @"Yes";
}
-(NSString *)noButtonTitle{
return @"No";
}
[ [ UIAlertView
alloc] initWithTitle:@"Title" message:@"Message" delegate:nil cancelButtonTitle:[self noButtonTitle] otherButtonTitles:[self yesButtonTitle],nil];
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
NSString *buttonTitle = [alertView buttonTItleAtIndex:buttonIndex];
if([buttonTitle isEqualToString:[self yesButtonTitle]]){
YES;
}else if([buttonTitle isEqualToString:[self noButtonTitle]]){
NO;
}
}
使用UISwitch創建及使用開關
定義以及初始化
@property(nonamotic,strong)UISwitch *muSwitch;
self.view.backgroundColor = [UIColor whiteColor];
self.mySwitch = [ [UISwitch alloc]initWithFrame:CGRectMake(100,100,0,0)];
self.view addSubview:self.mySwitch];
[self.mySwitch setOn:YES];//預設狀態
判斷開關
if([self.mySwitch isOn]){
NSLog(@"On");
}else{
NSLog(@"Off");
}
若希望在開關控件打開或關閉時得到消息通知信息，必須在類中加上開關的target。
[self.mySwitch addTatget:self action:@selector(switchIsChanged:) forControlEvents:UIControlEventValueChanged];
-(void)switchIsChanged:(UISwitch *)paramSender{
if([paramSender isOn]){
ON;
}else{
OFF;
}
}
使用UIPickerView來綁定數據
@interface PickerView:UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>
@property(nonamotic,strong)UIPickerView *myPicker;
@synthesize myPicker;
self.view.backgeoundColor = [UIColor whiteColor];
self.myPicker = [[UIPickerView alloc]init];
self.myPicker.dataSource = self;
self.myPicker.delegate = self;
self.myPicker.showsSelectionIndicator = YES; //水平陰影效果
self.myPicker.center = self.view.center;
self.view addSubview:self.myPicker];
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{//組件個數
NSInteger result = 0;
if([pickerView isEqual:self.myPicker]){
result = 1;
}
return result;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{//一個組件有多少個選項
NSInteger result = 0;
if([pickerView isEqual:self. myPicker]){
result = 10;
}
return result;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
NSString *result = nil;
if([pickerView isEqual:self. myPicker]){
result = [NSString stringWithFormat:@"Row %id",(long)row + 1];
}
return result;
}
//監聽方法
selectedRowInComponent:
//值重置
reloadCompoment:
使用UIDatePicker來進行日期和時間的綁定
@interface DatePicker:UIViewConteoller
@property(nonamotic,strong)UIDatePicker *myDatePicker;
@end
@synthesize myDatePicker;
self.myDatePicker.backgroundColor = [UIColor whiteColor];
self.myDatePicker = [[UIDatePicker alloc]init];
self.myDatePicker.center = self.view.center;
[self.view addSubview:self.myDatePicker];
[self.myDatePicker addTarget:self action:@selecter(datePickerDateChanged:) forControlEvents:UIControlEventValueChanged];
展示效果://根據你的需要來設置相關的參數
typedef enum{
UIDatePickerModeTime,
UIDatePickerModeDate,
UIDatePickerModeDateAndTime,
UIDatePickerModeCountDownTimer,
}UIDatePickerMode;
//取當前時間值
-(void)datePickerDateChanged:(UIDatePicker *)paramDatePicker{
if([paramDatePicker isEqual:self.myDatePicker]){
NSLog(@"Selected date = %@",paramDatePicker.date);
}
}
//限制選擇時間范圍(2013.1–2014.1)
NSDate *oneYearFromToday = [todayDate dateByAddingTimeInterval:oneYearTime];
NSDate *twoYearFromToday = [todayDate dateByAddingTimeInterval:2*oneYearTime];
self.myDatePicker.minimumDate = oneYearFromToday;
self.myDatePicker.maximumDate = twoYearsFromToday;
//秒表功能
-(void)viewDidLoad{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
self.myDatePicker = [[UIDatePicker alloc]init];
self.myDatePicker.datePickerMode = UIDatePickerModeCountDownTimer;
[self.view addSubview:self.myDatePicker];
NSTimeInterval townMinutes = 2 * 60;
[self.myDatePicker setCountDownDuration:twoMinutes];
}