096实现一个蓝色进度条效果（扩展知识：UIActionSheet和UIAlertView的使用）

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UIViewController<UIActionSheetDelegate, UIAlertViewDelegate>

4 @property (strong, nonatomic) UIProgressView *progressView;

5 

6 @end

ViewController.m

 1 #import "ViewController.h"

 2 

 3 @interface ViewController ()

 4 - (void)layoutUI;

 5 - (void)updateProgressView:(UIProgressView *)progressView;

 6 - (void)showAlert:(NSString *)msg;

 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     _progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault]; //设置进度条样式；默认值是UIProgressViewStyleDefault，设置的枚举值决定了进度条的高度大小

24     _progressView.frame = CGRectMake(0, 0, 220, 0);

25     _progressView.center = self.view.center;

26     [self.view addSubview:_progressView];

27 }

28 

29 - (void)viewDidAppear:(BOOL)animated {

30     [super viewDidAppear:animated];

31     [self performSelector:@selector(updateProgressView:)

32                withObject:_progressView

33                afterDelay:5];

34 }

35 

36 - (void)viewWillDisappear:(BOOL)animated {

37     [super viewWillDisappear:animated];

38     _progressView.hidden = YES;

39 }

40 

41 - (void)updateProgressView:(UIProgressView *)progressView {

42     if (!progressView.hidden) {

43         if (progressView.progress < 1.0) {

44             progressView.progress += 0.1;

45             [self performSelector:@selector(updateProgressView:)

46                        withObject:progressView

47                        afterDelay:1];

48         } else {

49             UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"下载完成"

50                                                                      delegate:self

51                                                             cancelButtonTitle:@"取消"

52                                                        destructiveButtonTitle:@"重新下载" otherButtonTitles:@"确定1", @"确定2", nil];

53             [actionSheet showInView:self.view];

54             

55             NSLog(@"[actionSheet title]=%@", [actionSheet title]);

56             NSLog(@"[actionSheet numberOfButtons]=%ld", (long)[actionSheet numberOfButtons]);

57         }

58     }

59 }

60 

61 - (void)showAlert:(NSString *)msg {

62     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"ActionSheet选择项"

63                                                     message:msg

64                                                    delegate:self

65                                           cancelButtonTitle:nil

66                                           otherButtonTitles:@"确定", nil];

67     [alert show];

68 }

69 

70 #pragma mark - ActionSheet

71 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

72     switch (buttonIndex) {

73         case 0:

74             [self showAlert:[NSString stringWithFormat:@"buttonIndex=%ld, destructiveButtonTitle=重新下载", buttonIndex]];

75             _progressView.progress = 0.0;

76             [self updateProgressView:_progressView];

77             break;

78         case 1:

79         case 2:

80             [self showAlert:[NSString stringWithFormat:@"buttonIndex=%ld, otherButtonTitles=确定1和确定2", buttonIndex]];

81             [self performSelector:@selector(updateProgressView:)

82                        withObject:_progressView

83                        afterDelay:5];

84             break;

85         case 3:

86             [self showAlert:[NSString stringWithFormat:@"buttonIndex=%ld, cancelButtonTitle=取消", buttonIndex]];

87             _progressView.hidden = YES;

88             break;

89         default:

90             break;

91     }

92 }

93 

94 #pragma mark - AlertView

95 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

96     NSLog(@"buttonIndex=%ld, otherButtonTitles=确定", (long)buttonIndex);

97 }

98 

99 @end