1 #import "AppDelegate.h"
2
3 @interface AppDelegate ()
4 @property (nonatomic,strong)UILabel *label;
5 @end
6
7 @implementation AppDelegate
8
9 - (void)dealloc
10 {
11 self.label = nil;
12 self.window = nil;
13 }
14
15 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
16 self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
17 // Override point for customization after application launch.
18 self.window.backgroundColor = [UIColor whiteColor];
19
20 UIDatePicker *picker = [[UIDatePicker alloc] initWithFrame:CGRectZero];
21 picker.datePickerMode = UIDatePickerModeDateAndTime;
22 // 添加事件
23 [picker addTarget:self action:@selector(changeDateOfPicker:) forControlEvents:UIControlEventValueChanged];
24 [self.window addSubview:picker];
25 // 创建label
26 self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 300, [UIScreen mainScreen].bounds.size.width, 100)];
27 self.label.backgroundColor = [UIColor clearColor];
28 self.label.textAlignment = NSTextAlignmentCenter;
29 [self.window addSubview:self.label];
30
31 [self.window makeKeyAndVisible];
32 return YES;
33 }
34
35 - (void)changeDateOfPicker:(UIDatePicker *)sender
36 {
37 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
38 [dateFormatter setDateFormat:@"Y/MM/dd H:mm:ss"];
39 NSString *dateString = [dateFormatter stringFromDate:[sender date]];
40
41 self.label.text = dateString;
42 }
43
44
45 @end
