IOS development (4): UIDatePicker Control

1 Preface
UIDatePicker is a class that is very similar to UIPickerView and is very common. Let's take a look at it today.

2 UIDatePicker Introduction
Code on
Date selection:
. H file:
[Plain]
@ Property (nonatomic, strong) UIDatePicker * myDatePicker;

@ Property (nonatomic, strong) UIDatePicker * myDatePicker;
. M file:
[Plain]
@ Synthesize myDatePicker;
 
-(Void) viewDidLoad
{
// The number of seconds in a year
Float oneYearTime = 60*60*24*365;
NSLog (@ "oneYearTime ===> % f", oneYearTime );
[Super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
Self. view. backgroundColor = [UIColor whiteColor];
// Event Selector
Self. myDatePicker = [[UIDatePicker alloc] init];
Self. myDatePicker. center = self. view. center;
Self. myDatePicker. datePickerMode = UIDatePickerModeDate;
// Add an event
[Self. myDatePicker addTarget: self action: @ selector (datePickerDateChanged :) forControlEvents: UIControlEventValueChanged];
// Obtain the current time
NSDate * currentDate = self. myDatePicker. date;
NSLog (@ "Date = % @", currentDate );
NSDate * oneYearFromToday = [currentDate dateByAddingTimeInterval: oneYearTime];
NSDate * twoYearFromToday = [currentDate dateByAddingTimeInterval: 2 * oneYearTime];
// Minimum optional time
Self. myDatePicker. minimumDate = oneYearFromToday;
Self. myDatePicker. maximumDate = twoYearFromToday;
[Self. view addSubview: self. myDatePicker];
}
 
-(Void) datePickerDateChanged :( UIDatePicker *) paramDatePicker {
If ([paramDatePicker isEqual: self. myDatePicker]) {
NSLog (@ "Selected date = % @", paramDatePicker );
}
}

@ Synthesize myDatePicker;

-(Void) viewDidLoad
{
// The number of seconds in a year
Float oneYearTime = 60*60*24*365;
NSLog (@ "oneYearTime ===> % f", oneYearTime );
[Super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
Self. view. backgroundColor = [UIColor whiteColor];
// Event Selector
Self. myDatePicker = [[UIDatePicker alloc] init];
Self. myDatePicker. center = self. view. center;
Self. myDatePicker. datePickerMode = UIDatePickerModeDate;
// Add an event
[Self. myDatePicker addTarget: self action: @ selector (datePickerDateChanged :) forControlEvents: UIControlEventValueChanged];
// Obtain the current time
NSDate * currentDate = self. myDatePicker. date;
NSLog (@ "Date = % @", currentDate );
NSDate * oneYearFromToday = [currentDate dateByAddingTimeInterval: oneYearTime];
NSDate * twoYearFromToday = [currentDate dateByAddingTimeInterval: 2 * oneYearTime];
// Minimum optional time
Self. myDatePicker. minimumDate = oneYearFromToday;
Self. myDatePicker. maximumDate = twoYearFromToday;
[Self. view addSubview: self. myDatePicker];
}

-(Void) datePickerDateChanged :( UIDatePicker *) paramDatePicker {
If ([paramDatePicker isEqual: self. myDatePicker]) {
NSLog (@ "Selected date = % @", paramDatePicker );
}
} Running effect:

Time Selection:
. M file:
[Plain]
(Void) viewDidLoad
{
[Super viewDidLoad];
// Do any additional setup after loading the view from its nib.
Self. view. backgroundColor = [UIColor whiteColor];
// Event Selector
Self. myDatePicker = [[UIDatePicker alloc] init];
Self. myDatePicker. center = self. view. center;
// Set it to the time mode
Self. myDatePicker. datePickerMode = UIDatePickerModeCountDownTimer;
[Self. view addSubview: self. myDatePicker];
NSTimeInterval twoMinutes = 2*60;
[Self. myDatePicker setCountDownDuration: twoMinutes];
}

-(Void) viewDidLoad
{
[Super viewDidLoad];
// Do any additional setup after loading the view from its nib.
Self. view. backgroundColor = [UIColor whiteColor];
// Event Selector
Self. myDatePicker = [[UIDatePicker alloc] init];
Self. myDatePicker. center = self. view. center;
// Set it to the time mode
Self. myDatePicker. datePickerMode = UIDatePickerModeCountDownTimer;
[Self. view addSubview: self. myDatePicker];
NSTimeInterval twoMinutes = 2*60;
[Self. myDatePicker setCountDownDuration: twoMinutes];
} UIDatePickerMode:
[Plain]
-Type enmu {
UIDatePickerModeTime, // time
UIDatePickerModeDate, // Date
UIDatePickerModeDateAndTime, // time and date
UIDatePickerModeCountDownTimer // countdown mode
}

-Type enmu {
UIDatePickerModeTime, // time
UIDatePickerModeDate, // Date
UIDatePickerModeDateAndTime, // time and date
UIDatePickerModeCountDownTimer // countdown mode
} Running result: