iOS exercises--fourth issue

1. For the string "2015-09-01 08:19:10" operation, output "08:19:10". Two methods of interception are required.

2. Access the following data in the array:

@[@{@ "name": @ "Chenfong" @ "Age": @ "32"},

@{@ "name": @ "Sun Ming" @ "age": @ "24"},

@{@ "name": @ "Wang Ming" @ "age": @ "12"},

@{@ "name": @ "Lisiek" @ "Age": @ "50"}

]

1) Sort by age (descending), output data

2) Delete "Chenfong" and output data

#import <Foundation/Foundation.h>

int Main (int argc, const Char * argv[]) {

@autoreleasepool {

 NSString *[email protected] "2015-09-01 08:19:10";        Nsrange range1=[str rangeofstring:@ "08:19:10"];        NSString *substr=[str Substringwithrange:range1];        NSLog (@ "The first question--(1)");        NSLog (@ "%@", subStr);        NSString *substr1=[str SubstringFromIndex:range1.location];        NSLog (@ "The first question--(2)");                        NSLog (@ "%@", SUBSTR1);                        Nsarray *[email protected][@{@ "name": @ "Chenfong", @ "age": @ "+"}, @{@ "name": @ "Sun Ming" @ "age": @ "24"},                        @{@ "name": @ "Wang Ming" @ "age": @ "{"}, @{@ "name": @ "Lisiek" @ "Age": @ "50"}                        ];        Nsdictionary *[email protected]{@ "name": @ "Chenfong" @ "Age": @ "32"};        Nsdictionary *[email protected]{@ "name": @ "Sun Ming" @ "age": @ "24"};        Nsdictionary *[email protected]{@ "name": @ "Wang Ming" @ "age": @ "12"};        Nsdictionary *[email protected]{@ "name": @ "Lisiek" @ "Age": @ "50"}; Nsmutablearray *arr=[[nsmutablearray Alloc]initwithobjecTs:dic1,dic2,dic3,dic4,nil];        Nssortdescriptor *sorts=[[nssortdescriptor alloc]initwithkey:@ "age" ascending:yes];        [Arr Sortusingdescriptors:[nsarray arraywithobjects:sorts, Nil]];        NSLog (@ "The second question--(1)");        NSLog (@ "After sorting-(ascending)");        For (Nsdictionary *dic in arr) {NSLog (@ '%@%@ ', dic[@ ' name '],dic[@ ' age ']);        } NSLog (@ "after sort-(descending)");        Nssortdescriptor *sorts1=[[nssortdescriptor alloc]initwithkey:@ "age" ascending:no];        [Arr Sortusingdescriptors:[nsarray arraywithobjects:sorts1, Nil]];        For (Nsdictionary *dic in arr) {NSLog (@ '%@%@ ', dic[@ ' name '],dic[@ ' age ']);        } NSLog (@ "The second question--(2)");            for (int I=0;i<[arr count];i++) {nsdictionary *dic=arr[i];            if ([dic[@ "name"] isequal:@ "Chenfong"]) {[Arr removeobject:dic];        }} for (Nsdictionary *dic in arr) {NSLog (@ '%@%@ ', dic[@ ' name '],dic[@ ' age ']); }

}

Return 0;

}

iOS exercises--fourth issue