oc字符串截取 数组字典运用

#define NSLog(FORMAT, ...) printf("%s\n", [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String])

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

@autoreleasepool {

//1.对字符串“2015-09-01 08:19:10”操作，输出"08:19:10"。要求使用两种截取方式。

NSString *str=@"2015-09-01 08:19:10";

NSLog(@"第一种");

NSString *newstr2=[str substringFromIndex:11];

NSLog(@"%@",newstr2);

NSLog(@"第二种");

NSRange rang;

rang.location=11;

rang.length=8;

NSString *newStr3=[str substringWithRange:rang];

NSLog(@"%@",newStr3);

/*2.数组中存取以下数据: */

NSArray *str1=@[ @{@"name":@"陈丰",@"age":@"32"},

@{@"name":@"孙明",@"age":@"24"},

@{@"name":@"王明",@"age":@"12"},

@{@"name":@"李西",@"age":@"50"}

];

//1)按年龄进行排序(降序)，输出数据

NSSortDescriptor *ageWithSort=[[NSSortDescriptor alloc]initWithKey:@"age" ascending:NO];

NSArray *newarr=[NSArray arrayWithObject:ageWithSort];

NSArray *sortArray=[str1 sortedArrayUsingDescriptors:newarr];

for (NSDictionary *dic in sortArray) {

NSLog(@"姓名:%@,年龄:%@",dic[@"name"],dic[@"age"]);

}

//2）删除“陈丰”并输出数据

NSMutableArray *muarr=[NSMutableArray array];

for (int i=0; i<sortArray.count; i++) {

NSDictionary *dic1=sortArray[i];

if ( ![ [dic1 objectForKey:@"name"] isEqual:@"陈丰"]) {

[muarr addObject:dic1];

}

}

NSLog(@"删除后数据");

for (NSDictionary *dic1 in muarr) {

NSLog(@"姓名:%@,年龄:%@",dic1[@"name"],dic1[@"age"]);

}

}

return 0;

}