ObjectC----几个小练习

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  //  Created By 郭仔   2015年04月04日20:35:30   

一.将“?文艺?青年”改成“213?青年”。

将 整数123 转换为字符串“123”。
将 “i love you”单词?首字?母变?大写 “I love You”
截取字符串“20|http://www.baidu.com”中 “|” 前?面和后?面的字符串, 并输出。

// NSString * str = [[NSString alloc] initWithString:@"文艺青年"];
    NSString * str = @"文艺青年";
    NSLog(@"%@",str);
    NSString * str2 = [str stringByReplacingOccurrencesOfString:@"文艺" withString:@"123"];
    NSLog(@"%@",str2);
    
     //=================================================
    
    
    NSInteger  a = 122;
    NSString * str3 = [NSString stringWithFormat:@"%ld",a];
    NSLog(@"%@",str3);
     //=================================================
  
    NSString * str4 = @"i love you";
    NSString * str5 = [str4 capitalizedString]; //字符串中每个单词首字母变大写
    NSLog(@"%@",str5);
     //=================================================
    
    NSString * str6 = @"20|http://www.baidu.com";
    NSArray * arry = [str6 componentsSeparatedByString:@"|"];
    for (NSString *s in arry) {
        NSLog(@"%@",s);
    }

NSNumber * int_number = [NSNumber numberWithInt:10];
    NSMutableArray * mularr = [NSMutableArray arrayWithObjects:int_number, nil];
    NSNumber * double_number = [NSNumber numberWithDouble:23.5];
    [mularr addObject:double_number];
    NSNumber * bool_number = [NSNumber numberWithBool:YES];
    [mularr addObject:bool_number];
    NSRange  range = {1,5}; // 注意这里不能带*号
    NSValue * range_struct = [NSValue valueWithRange:range];
    [mularr addObject:range_struct];
   // NSLog(@"%@",range_struct);
    for (int i = 0;i < [mularr count];i ++)
    {
        NSLog(@"%@",mularr[i]);
       // NSLog(@"%@",[mularr objectAtIndex:i]);
    }
    // 若需要变回原来的类型则需要用intValue，doubleValue等

1、定义联系?人类Contact。实例变量:姓名、性别、电话号码、住址、分组名称。?方 法:初始化?方法(姓名、电话号码)、显?示联系?人信息? 

2、在main.m中定义可变数组,管理所有联系?人。可以添加新联系?人对象,如果姓名 或电话号码为空,打印添加失败。?
3、获取某个分组下的所有联系?人。?
4、根据电话号码搜索联系?人。?
5、获取所有?女性联系?人?
6、根据姓名删除联系?人?
7、删除某个分组全部联系?人 ?
8、展?示通讯录中所有联系?人?
9、选做:定义AddressBook类,封装上述功能。

===================================================================================

我是在定义了一个NSMutableArray分类，然后在其中实现了不同的代码块

方法类：

- (void)addContact:(Contact *)contact;
- (void)getContactsOfAnyOneOfGroub:(NSString *)groub;
- (void)searchContactWithPhone:(NSString *)phone;
- (void)deleteContactWithName:(NSString *)name;
- (void)deleteContactOfGroub:(NSString *)groub;
- (void)showAllContacts;

<span style="font-size:18px;">- (void)addContact:(Contact *)contact
{
    
        if (([contact.name isEqualToString:@""]==1)||([contact.phone isEqualToString:@""]==1)) {
            NSLog(@"添加失败！");
        }
        else{
            [self addObject:contact];
        }
        
}
- (void)getContactsOfAnyOneOfGroub:(NSString *)groub
{
    for(Contact *contact in self)
    {
        if ([contact.groub compare:groub] == 0)
        NSLog(@"%@",contact);
    }
}
- (void)searchContactWithPhone:(NSString *)phone
{
    int temp = 0;
    for(Contact *contact in self)
    {
        if ([contact.phone compare:phone] == 0)
        {
            NSLog(@"%@",contact);
            temp = 1;
        }
    }
    if (temp == 0) {
        NSLog(@"Do not have this contact");
    }
}
- (void)deleteContactWithName:(NSString *)name
{
    for (int i = 0; i < [self count]; i ++) {
        if ([[self[i] name] compare:name] == 0) {
            [self removeObject:self[i]];
            break;
        }
    }

}
- (void)deleteContactOfGroub:(NSString *)groub
{
    for (int i = 0; i < [self count]; i ++) {
        if ([[self[i] groub] compare:groub]==0) {
            [self removeObject:self[i]];
            i --; // 关键：回溯
        }
    }
}
- (void)showAllContacts
{
    for(Contact *contact in self)
        NSLog(@"%@",contact);
}
</span>

当然别忘了：

- (NSString *)description
{
   
    NSString * str = [[NSString alloc]initWithFormat:@"%@ %@ %@",_name,_phone,_groub];
    return str;
}

- (instancetype)initWithDate:(NSDate *)date forFormat:(NSString *)str
{
    NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:str];
    str = [formatter stringFromDate:date];
    return str ;
}

// =====================================
    NSDate * date = [NSDate date];
    NSLog(@"dd");
    NSString * str = [[NSString alloc] initWithDate:date forFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSLog(@"%@",str);
// =====================================

+ (void)convert:(NSMutableArray *)mulArray
{
    for (int i = 0,j = (int)[mulArray count]-1; i<j; i ++,j --) {
        [mulArray exchangeObjectAtIndex:i withObjectAtIndex:j];
    }
    
}
- (void)convert:(NSMutableArray *)mulArray
{
    for (int i = 0,j = (int)[mulArray count]-1; i<j; i ++,j --) {
        [mulArray exchangeObjectAtIndex:i withObjectAtIndex:j];
    }

}

六.定义结婚协议，Woman是代理，为Boy做家务挣钱。。。。。

@protocol MarryProcotol <NSObject>

@required
- (void)makeMoney;

@optional
- (void)cook;

@end

@interface Woman : NSObject<MarryProcotol>

- (void)makeMoney
{
    NSLog(@"Woman--makeMoney");
}

- (void)cook
{
    NSLog(@"Woman--cook");
}

id<MarryProcotol> _protocol;

- (void)setProtocol:(id<MarryProcotol>)protocol;
- (id<MarryProcotol>)protocol;

- (void)playGame;
- (void)watchFilm;

- (void)playGame
{
    NSLog(@"Boy--playGame");
    [_protocol makeMoney];
}
- (void)watchFilm
{
    NSLog(@"Boy--watchFilm");
    [_protocol cook];
}

- (void)setProtocol:(id<MarryProcotol>)protocol
{
    _protocol = protocol;
}
- (id<MarryProcotol>)protocol
{
    return _protocol;
}

下面Woman要位Boy做家务挣钱了

    Boy *boy =[[Boy alloc] init];
    Woman *woman = [[Woman alloc]init];
    [boy setProtocol:woman];
    [boy playGame];
    [boy watchFilm];

typedef BOOL (^Block)(NSString*,NSString*);

 Block block = ^(NSString *str1,NSString *str2){
        if ([str1 isEqualToString:str2]) {
            return YES;
        }
        else
            return NO;
    };
    if(block(@"sds",@"ddd"))
    {
        NSLog(@"Equal");
    }
    else
        NSLog(@"!Equal");

  __block int i = 0;
    Block2 block2 = ^(NSString *str,NSArray * arr){
        for (i = 0; i < [arr count]; i ++) {
            NSString * str2 = [arr objectAtIndex:i];
            if([str isEqualToString:str2])
                return (NSInteger)i;
        }
        return (NSInteger)-1;
    
    };
    NSArray * array = [NSArray arrayWithObjects:@"guo",@"zai", nil];
    NSLog(@"%ld",block2(@"zai",array));

  NSArray * arr = [NSArray arrayWithObjects:@"123",@"21",@"33",@"69",@"108",@"256" ,nil];
    NSArray * arr2 = [arr sortedArrayWithOptions:NSSortStable usingComparator:^NSComparisonResult(NSString *obj1, NSString *obj2) {
        if((int)[obj1 compare: obj2]>0)
            return NSOrderedDescending;
        else if([obj1 compare: obj2]==0)
            return NSOrderedSame;
        else return NSOrderedAscending;
    }];
    
    for (NSString * s in arr2) {
        NSLog(@"%@",s);
    }

ObjectC----几个小练习

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原文地址：http://blog.csdn.net/guoxianzhuang/article/details/44875741