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：

 //
 //  ShowStatesViewController.m
 //  testForNotification
 //
 //  Created by bos on 15-4-15.
 //  Copyright (c) 2015年 axiba. All rights reserved.
 //

 #import "ShowStatesViewController.h"

 @interface ShowStatesViewController ()

 @property (weak, nonatomic) IBOutlet UILabel *charactersLabel;

 @end

 @implementation ShowStatesViewController

 #pragma  life of the view

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view.

 }

 -(void)viewWillAppear:(BOOL)animated
 {
     [super viewWillAppear:animated];

     //when the view appear ,we should update the ui from the new value
     [self UpdateUI];
 }

 #pragma getter and setter
 -(void)setTestContent:(NSAttributedString *)testContent
 {
     _testContent = testContent;
     //if (self.view.window) {
         [self UpdateUI];
     //}
 }

 #pragma private function
 -(void)UpdateUI
 {
     //push the attributeName into
     self.charactersLabel.text = [NSString stringWithFormat:@"%lu of all",(unsigned long)[[self getCharactersByAttributeName:NSForegroundColorAttributeName] length]];
 }

 -(NSAttributedString *)getCharactersByAttributeName:(NSString *)attributedName
 {
     NSMutableAttributedString *character = [[NSMutableAttributedString alloc]init];

     int index = ;

     // one by one check the range of the attribute
     while(index < [self.testContent length])
     {
         NSRange mRange;
         //the effect of range
         id value = [self.testContent attribute:attributedName atIndex:index effectiveRange:&mRange];

         if(value)
         {
             //the range of the characters
             [character appendAttributedString:[self.testContent attributedSubstringFromRange:mRange]];
             index = mRange.length + mRange.location;
         }else{
             index++;
         }
     }

     return character;
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 /*
 #pragma mark - Navigation

 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
     // Get the new view controller using [segue destinationViewController].
     // Pass the selected object to the new view controller.
 }
 */

 @end

ViewController.m

 //from other segue
 -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
 {
     if ([segue.identifier isEqualToString:@"calulate the num"]) {
         if ([segue.destinationViewController isKindOfClass:[ShowStatesViewController class]]) {
             ShowStatesViewController *showVC = (ShowStatesViewController *)segue.destinationViewController;
             showVC.testContent = self.content.textStorage;
         }
     }
 }

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