OC开发_Storyboard——NaviationController简单例子

 一个简单的Navigation的例子，demo里面用到了上一个demo的MVC，可以参考下：http://www.cnblogs.com/daomul/p/4426063.html

 建立一个Nav其实灰常简单，通过Editor－>embed in ->NaviationController可以直接引入，就不具体介绍了。效果如下：

 

代码如下：

ShowStatesViewController.m：

 1 //
 2 //  ShowStatesViewController.m
 3 //  testForNotification
 4 //
 5 //  Created by bos on 15-4-15.
 6 //  Copyright (c) 2015年 axiba. All rights reserved.
 7 //
 8 
 9 #import "ShowStatesViewController.h"
10 
11 @interface ShowStatesViewController ()
12 
13 @property (weak, nonatomic) IBOutlet UILabel *charactersLabel;
14 
15 @end
16 
17 
18 @implementation ShowStatesViewController
19 
20 #pragma  life of the view
21 
22 
23 - (void)viewDidLoad {
24     [super viewDidLoad];
25     // Do any additional setup after loading the view.
26 
27 }
28 
29 -(void)viewWillAppear:(BOOL)animated
30 {
31     [super viewWillAppear:animated];
32     
33     //when the view appear ,we should update the ui from the new value
34     [self UpdateUI];
35 }
36 
37 #pragma getter and setter
38 -(void)setTestContent:(NSAttributedString *)testContent
39 {
40     _testContent = testContent;
41     //if (self.view.window) {
42         [self UpdateUI];
43     //}
44 }
45 
46 
47 #pragma private function
48 -(void)UpdateUI
49 {
50     //push the attributeName into
51     self.charactersLabel.text = [NSString stringWithFormat:@"%lu of all",(unsigned long)[[self getCharactersByAttributeName:NSForegroundColorAttributeName] length]];
52 }
53 
54 -(NSAttributedString *)getCharactersByAttributeName:(NSString *)attributedName
55 {
56     NSMutableAttributedString *character = [[NSMutableAttributedString alloc]init];
57     
58     int index = 1;
59     
60     // one by one check the range of the attribute
61     while(index < [self.testContent length])
62     {
63         NSRange mRange;
64         //the effect of range
65         id value = [self.testContent attribute:attributedName atIndex:index effectiveRange:&mRange];
66         
67         if(value)
68         {
69             //the range of the characters 
70             [character appendAttributedString:[self.testContent attributedSubstringFromRange:mRange]];
71             index = mRange.length + mRange.location;
72         }else{
73             index++;
74         }
75     }
76     
77     return character;
78 }
79 
80 
81 
82 - (void)didReceiveMemoryWarning {
83     [super didReceiveMemoryWarning];
84     // Dispose of any resources that can be recreated.
85 }
86 
87 /*
88 #pragma mark - Navigation
89 
90 // In a storyboard-based application, you will often want to do a little preparation before navigation
91 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
92     // Get the new view controller using [segue destinationViewController].
93     // Pass the selected object to the new view controller.
94 }
95 */
96 
97 @end

 

ViewController.m

 1 //from other segue
 2 -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
 3 {
 4     if ([segue.identifier isEqualToString:@"calulate the num"]) {
 5         if ([segue.destinationViewController isKindOfClass:[ShowStatesViewController class]]) {
 6             ShowStatesViewController *showVC = (ShowStatesViewController *)segue.destinationViewController;
 7             showVC.testContent = self.content.textStorage;
 8         }
 9     }
10 }

 

注意的是：

1、 getCharactersByAttributeName这个方法是用来：通过属性类型（比如颜色，这里就是用的颜色）来获得具备该属性的文字，当然这个文字是属性化的文字，里面的算法中range是作为连续的字符是具备该属性的范围

2、UpdateUI主要是用来更新UI界面效果，通过获取该属性字符串的长度返回到第二个界面中显示

3、ViewController.m主要是通过这个界面传递值到 第二个界面，传递是通过segue的，需要通过判断identifier,这里需要在storyBoard中设置对应上。

demo下载：http://pan.baidu.com/s/1dDCkgt7

 

posted @ 2015-05-03 11:01  daomul  阅读(353)  评论(0)  编辑  收藏  举报