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 = 1;
    
    // 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