161设置在屏幕中的动画延迟（扩展知识：普通操作和代码块操作实现动画效果）

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UIViewController

4 @property (strong, nonatomic) UIImageView *imgVAnimation;

5 

6 @end

ViewController.m

 1 #import "ViewController.h"

 2 

 3 @interface ViewController ()

 4 - (void)layoutUI;

 5 - (void)animationByNormalOperation;

 6 - (void)animationByBlockOperation;

 7 @end

 8 

 9 @implementation ViewController

10 

11 - (void)viewDidLoad {

12     [super viewDidLoad];

13     

14     [self layoutUI];

15 }

16 

17 - (void)didReceiveMemoryWarning {

18     [super didReceiveMemoryWarning];

19     // Dispose of any resources that can be recreated.

20 }

21 

22 - (void)layoutUI {

23     self.view.backgroundColor = [UIColor blackColor];

24     NSString *path = [[NSBundle mainBundle] pathForResource:@"Star" ofType:@"png"];

25     _imgVAnimation = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:path]];

26     _imgVAnimation.frame = CGRectMake(0, 0, 20.0, 20.0);

27     _imgVAnimation.center = CGPointMake(10.0, 30.0);

28     [self.view addSubview:_imgVAnimation];

29 }

30 

31 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

32     _imgVAnimation.center = CGPointMake(10.0, 30.0);

33     

34     [self animationByBlockOperation];

35 }

36 

37 /**

38  *  普通操作设置动画

39  */

40 - (void)animationByNormalOperation {

41     [UIView beginAnimations:nil context:NULL];

42     [UIView setAnimationDuration:1.5]; //设置动画持续时间；默认值为0.2s

43     [UIView setAnimationDelay:1.0]; //设置动画延迟时间；默认值为0.0s

44     [UIView setAnimationRepeatCount:5.0]; //设置动画播放重复次数；默认值为0，表示不循环只执行一次（区别于UIImageView.animationRepeatCount=0为无限循环）

45     _imgVAnimation.center = CGPointMake(220, 400);

46     [UIView commitAnimations];

47 }

48 

49 /**

50  *  代码块设置动画

51  */

52 - (void)animationByBlockOperation {

53     [UIView animateWithDuration:1.5

54                           delay:1.0

55                         options:UIViewAnimationOptionTransitionNone

56                      animations:^{

57                          [UIView setAnimationRepeatCount:5.0];

58                          _imgVAnimation.center = CGPointMake(220, 400);

59                      } completion:^(BOOL finished) {

60                          

61                      }];

62 }

63 

64 @end