iOS基础面试题一

-(void)person
-(void)personWithAge;
-(void)personWithAge:(int)age;
-(void)personWithAge:(int)age name:(NSString *)name;

-(void)blockWithoutParameterAndReturnData
{
    void(^myBlock)(void)  = ^ {
        NSLog(@"This is a block without parameter and returned value");
    };
    myBlock();
}

      -(void)AddParameterAndRestunValuesForBlock
{
    int(^blocknames)(int) = ^(int num) {
        return num * 30;
    };
    int result = blocknames(2);
    NSLog(@"%d",result);
}　

   self.age = 20;           自动生成[set stAge:20];
     int age = self.age;      //有待完善
     NSArray *names = @[@“mj”,@”jj”,@“jay”];    //   NSArray *names = [[NSArray alloc] initWithObjects:@"mj",@"jj",@"jay", nil];
     id money = @20;                自动生成：    NSNumber *money1 = [[NSNumber alloc] initWithInt:20];

- (NSInteger)addToN1:(NSInteger)n {
    NSInteger total = 0;
    for(int i=1;i<=n;i++) {
        total +=i;
    }
    return total;
}

  - (NSInteger)addToN2:(NSInteger)n {
    NSInteger total = 0;
    total = n*(n+1)/2;
    return total;
     }

     NSMutableArray+Additions.h
//
//  NSMutableArray+Additions.h
//  MianShiDemo
//
//  Created by zhanggui on 15/7/19.
//  Copyright (c) 2015年 zhanggui. All rights reserved.
//
 
#import <Foundation/Foundation.h>
 
@interface NSMutableArray (Additions)
 
+(NSMutableArray *)sortValues:(NSMutableArray *)mutableArray;
@end
NSMutableArray+Additions.m
//
//  NSMutableArray+Additions.m
//  MianShiDemo
//
//  Created by zhanggui on 15/7/19.
//  Copyright (c) 2015年 zhanggui. All rights reserved.
//

#import "NSMutableArray+Additions.h"

@implementation NSMutableArray (Additions)

+(NSMutableArray *)sortValues:(NSMutableArray *)mutableArray
{
    NSComparator finderSort = ^(id string1,id string2) {
        if ([string1 integerValue]>[string2 integerValue]) {
            return (NSComparisonResult)NSOrderedDescending;
        }else if ([string1 integerValue]<[string2 integerValue])
        {
            return (NSComparisonResult)NSOrderedAscending;
        }else
        {
            return (NSComparisonResult)NSOrderedSame;
        }
    };
    NSMutableArray *arr= [[NSMutableArray alloc] initWithCapacity:[mutableArray count]];
    NSArray *sortedArr = [mutableArray sortedArrayUsingComparator:finderSort];
    for(int i=0;i<[mutableArray count];i++) {
        [arr addObject:[sortedArr objectAtIndex:i]];
    }
    return arr;
}
@end
测试方法：
- (void)viewDidLoad {
    [super viewDidLoad];
    NSMutableArray *mutableArray = [[NSMutableArray alloc] initWithObjects:@"5",@"20",@"3",@"60" ,@"50",nil];
    NSLog(@"%@",[NSMutableArray sortValues:mutableArray]);
}
13、使用Category给所有OC对象增加一个run方法（对象方法），然后在run方法中NSLog打印对象本身：
     NSObject+Additions.h
      //
//  NSObject+Additions.h
//  MianShiDemo
//
//  Created by zhanggui on 15/7/19.
//  Copyright (c) 2015年 zhanggui. All rights reserved.
//
 
#import <Foundation/Foundation.h>
 
@interface NSObject (Additions)
 
-(void)run;
@end
NSObject+Additions.m
//
//  NSObject+Additions.m
//  MianShiDemo
//
//  Created by zhanggui on 15/7/19.
//  Copyright (c) 2015年 zhanggui. All rights reserved.
//
 
#import "NSObject+Additions.h"
 
@implementation NSObject (Additions)
 
-(void)run
{
    NSLog(@"%@",self);
}
@end

  NSString+Additions.h
//
//  NSString+Additions.h
//  MianShiDemo
//
//  Created by zhanggui on 15/7/19.
//  Copyright (c) 2015年 zhanggui. All rights reserved.
//
 
#import <Foundation/Foundation.h>
 
@interface NSString (Additions)
 
/**判断NSString中含有的字母个数*/
-(NSInteger)getNumberOfLetterInString;
 
/**反转字符串*/
-(NSString *)reversalString;
//删除开始和结束的字符串
-(NSString *)deleteBackAndForwardBlank;
//得到域名
-(NSString *)getDominFromWebLink;
@end
 
NSString+Additions.m
     //
//  NSString+Additions.m
//  MianShiDemo
//
//  Created by zhanggui on 15/7/19.
//  Copyright (c) 2015年 zhanggui. All rights reserved.
//

#import "NSString+Additions.h"

@implementation NSString (Additions)

-(NSInteger)getNumberOfLetterInString
{
    NSInteger strLength = self.length;
    int result = (int)strLength;
    for(int i=0;i<strLength;i++) {
        char c = [self characterAtIndex:i];
        if (c>=‘0‘ && c<= ‘9‘) {     //判断是不是数字
            result = result-1;
            NSLog(@"数字有：%c",c);
        }
    }
    return result;
}
-(NSString *)reversalString
{
    NSMutableString *s = [NSMutableString string];
    NSUInteger length = self.length;
    for(NSUInteger i=length;i>0;i--) {
        [s appendString:[self substringWithRange:NSMakeRange(i-1, 1)]];
    }
    return s;
}
-(NSString *)deleteBackAndForwardBlank
{
   
    NSString *trimmedString = [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
  
    return trimmedString;
}
-(NSString *)getDominFromWebLink
{
    NSString *tempString = [NSString string];
    NSRange wwwRange = [self rangeOfString:@"www."];
    NSRange comRange = [self rangeOfString:@".com"];
    NSRange needRange =NSMakeRange(wwwRange.length+wwwRange.location, comRange.location-wwwRange.location-wwwRange.length);
    tempString = [self substringWithRange:needRange];
    return tempString;
}
@end