#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 *time=@"2015-09-01 08:19:10";
NSString *str1=[time substringFromIndex:11 ];
NSRange rang={11,8};
NSString *str2=[time substringWithRange:rang];
NSLog(@"index:%@,range:%@",str1,str2);
/*2.数组中存取以下数据:
@[@{@"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
2)删除“陈丰”并输出数据
*/
NSDictionary *dic1=@{@"name":@"陈丰",@"age":@"32"};
NSDictionary *dic2=@{@"name":@"孙明",@"age":@"24"};
NSDictionary *dic3=@{@"name":@"王明",@"age":@"12"};
NSDictionary *dic4=@{@"name":@"李西",@"age":@"50"};
NSArray *arr=[NSArray arrayWithObjects:dic1,dic2,dic3,dic4,nil];
NSSortDescriptor *disc=[[NSSortDescriptor alloc]initWithKey:@"age" ascending:NO];
NSArray *eleSort=[NSArray arrayWithObjects:disc,nil];
NSArray *arrSort=[arr sortedArrayUsingDescriptors:eleSort];
for(NSDictionary *dic in arrSort){
NSLog(@"name:%@,age:%@",dic[@"name"],dic[@"age"]);
}
NSMutableArray *mutArr=[NSMutableArray arrayWithArray:arrSort];
for(int i=0;i<mutArr.count;i++){
if([mutArr[i][@"name"] isEqual:@"陈丰"]){
[mutArr removeObject:mutArr[i]];
}
}
for(NSDictionary *dic2 in mutArr){
NSLog(@"name:%@,age:%@",dic2[@"name"],dic2[@"age"]);
}
}
return 0;
}