NSString and Nsarray usually practice summary

/************************* String Practice ****************************/    //Create a string//1. Quickly createNSString *STR1 =@"Happyday"; //string created by 2.allocNSString *STR2 = [[NSString alloc] initwithstring:@"Happyday"]; //3.alloc created with a format characterNSString *STR3 = [[NSString alloc] Initwithformat:@"Happyday"]; //4. Class methods are created by using a format characterNSString *STR4 = [NSString stringwithstring:@"Happyday"]; //5. Compare strings If they are identicalBOOL result =[str1 ISEQUALTO:STR2]; NSLog (@"5. Compare strings in the same way:%d", result); //6. Compare string Size nsorderedascending = -1l, Nsorderedsame, nsordereddescending his three return valuesNscomparisonresult RESULT1 = [str1 compare:str2];//This is case-sensitive.Nscomparisonresult result2 = [str1 caseinsensitivecompare:str2];//This is case- insensitive//7. String lengthNsuinteger RESULT3 =[str1 length]; //8. Case ConversionNSString *STR5 = [str1 uppercasestring];//this is converted into uppercaseNSString *STR6 = [str1 lowercasestring];//this is converted to lowercase.//9. Convert to basic data type    intA = [str1 integervalue];//convert to int type    floatb = [str1 floatvalue];//convert to float type    Doublec = [str1 doublevalue];//convert to double typeBOOL d = [str1 boolvalue];//Convert to bool type//10. Splitting a stringNsarray *array1 = [str1 componentsseparatedbystring:@""];//to divide a string into an array by means of something inside @ ""//11. Accessing the specified position character//when I see the characters, I think of the things in front of Char[Str1 Characteratindex:2];//access to the location of this character in Atindex//Interception of Strings//12.1 intercept to the specified position[Str1 Substringtoindex:3];//all characters from the beginning to the third one//12.2 Intercept from the specified position to the end[Str1 Substringfromindex:3];//starting from the third, including the third, until the end .//12.3 Specify range interceptNsrange Range1 = {2,5};  [Str1 Substringwithrange:range1]; //intercept 5 characters from the beginning of the 2nd//13. Three ways to stitch stringsNSString *STR7 = [[NSString alloc] Initwithformat:@""];//1, the creation of the time when the initialization can be assigned value//A variable string is used to stitch a stringnsmutablestring *string1 = [[Nsmutablestring alloc] Initwithformat:@""]; [String1 appendString:@""];//plus a string[String1 AppendFormat:@""];//formatted string[String1 insertstring:@""Atindex:2];//join string in 2nd place//14. Finding StringsNsrange range = [str1 rangeofstring:@""];//find @ "" where the return value is a value of type Nsrange    inta1 = Range.length;//the length of his    intB1 = range.location;//his starting position;//15. Replacing Strings[Str1 stringbyreplacingcharactersinrange:range withstring:@""];//Find a location and replace with @ ""       /************************* Array Practice ****************************/    //1. Create with AllocNsarray*ARR1 = [[Nsarray alloc] Initwithobjects:@"Array", nil];//multiple arrays into whichNsarray *arra1 = @[@"Array Object"]; //2. Create by class methodNsarray *ARR2 = [Nsarray arraywithobjects:@"same as the first one", nil]; //3. Get the object labeled 0[Arr1 Objectatindex:0];//If you're looking for an object, if you want it, you want it. Index//4. Number of elements in an array    intC1 =[arr1 Count]; //5. Determine if an object is included[Arr1 Containsobject:@""];//whether the containing object contains is contain//6. Index position of the object in the array[Arr1 Indexofobject:@""];//I 'm looking for a location.//7. Concatenate strings in an array[Arr1 componentsjoinedbystring:@""];//to connect the elements of an array together//8. Last Element Object[Arr1 Lastobject];// Last//9.xcode4.4 New syntax to create an arrayNsarray *arra2 = @[@"Array Object"];//This is the new syntax .//10.xcode4.4 new syntax to access elements in an arrayarra2[0];//This is the No. 0 element of the new syntax access    /******* variable Array Practice * * * * **/    //11. Create a variable array, set 5 storage spaceNsmutablearray *muarr1 = [[Nsmutablearray alloc] Initwithobjects:@"Array", nil];//This is a mutable array of strings//12. Adding elements[Muarr1 AddObject:@"Elements"];//Add an element[Muarr1 Addobjectsfromarray:@"the array is added"];//addend groups in arrays//13. Inserting elements in the specified position[Muarr1 InsertObject:@"Elements"Atindex:2];//add an element in the second position//14. Replacing Elements[Muarr1 Replaceobjectatindex:2Withobject:@"Elements"];//Replace the second element with a @ ""//15. Swap the position of two elements[Muarr1 Exchangeobjectatindex:2Withobjectatindex:4];//swap the second exchange with the fourth one. Exchange//16. Add an element from another array to the current array. [Muarr1 Addobjectsfromarray:@"Array"];//adds an element from another array to the current array//17. Delete the element at the specified location[Muarr1 Removeobjectatindex:2];//Delete is different from string, remove//18. Delete the specified object[Muarr1 Removeobject:@"Elements"];//a specific element//19. Delete the last element[Muarr1 Removelastobject];//is the last one .//20. Delete all elements[Muarr1 removeallobjects];//that's all.//21. Use 2 loops to iterate through an array.      for(Nsinteger i =0; I < muarr1.count;i++) {NSString*p = [Muarr1 objectatindex:i];//is to put I where I need to be the first kindNSLog (@"%@", p); }    for(Nsintegeri =0; I < muarr1.count;i++) {NSString*p = Muarr1[i];//use the new method to output the element at the appropriate locationNSLog (@"%@", p); }

NSString and Nsarray usually practice summary