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