#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 *new=[time substringFromIndex:11];
NSRange rang;
rang.location=11;
rang.length=8;
NSString *newStr=[time substringWithRange:rang];
NSLog(@"%@",newStr);
NSLog(@"%@",new);
/*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
*/
NSArray *arr=@[@{@"name":@"陈丰",@"age":@"32"},
@{@"name":@"孙明",@"age":@"24"},
@{@"name":@"王明",@"age":@"12"},
@{@"name":@"李西",@"age":@"50"}];
NSSortDescriptor *sortArr=[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:0];
NSArray *arr1=[arr sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortArr]];
for(NSDictionary *sort in arr1){
NSLog(@"%@ %@",sort[@"name"],sort[@"age"]);
}
NSLog(@"????????????????????????????");
//2)删除“陈丰”并输出数据
for(NSDictionary *dic in arr1){
if (![[dic objectForKey:@"name"]isEqual:@"陈丰"]) {
NSLog(@"%@ %@",dic[@"name"],dic[@"age"]);
}
}
}
return 0;
}