objective-c-Use of strings

typedef struct PERSON

{

int age;

Char *name;

}person;

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

@autoreleasepool {

person person;

Person.name = "Little Fellow";

Person.age = 20;

Person Liusanjie;

Liusanjie.name = "Liu Sanjie";

Liusanjie.age = 45;

/*

1, the string is divided into variable strings and immutable strings;

2, the initialization of the string method;

3, the string is not a container class, can not add data;

*/

NSString *string = [[NSString alloc]init];

NSString *string1 = [NSString string];

NSString *string2 = [[NSString alloc]initwithstring:string1];

NSString *string3 = @ "Qwe";

int age;

NSLog (@ "%d", age);

Assigning a value to a string

string = @ "120";

/ * processing of strings;

1, the format of the string processing;

*/

Age = 20;

NSString *name = @ "Xiaozhuang";

NSString *info = [NSString stringwithformat:@ "%@ is%d years old", Name,age];

NSLog (@ "%@", info);

/*

A string that intercepts that position;

where to intercept;

Where to start the interception;

*/

1, from which position to start intercepting the string;

NSString *newstring = [info substringfromindex:4];

NSLog (@ "%@", newstring);

Practice

NSString *string4 = @ "Hoe wo day copse, sweat wo xia Tu, ... ";

NSString *newstring2 = [info substringfromindex:10];

NSLog (@ "%@", [String4 substringfromindex:12]);

2, intercept the string to that position;

NSLog (@ "%@", [String4 substringtoindex:12]);

NSLog (@ "%@", [String4 substringtoindex:6]);

3, from where to start to where the end of the position;

Nsrange range;

Range.location = 5;

On the basis of this position, continue to count several lengths;

Range.length = 7;

The length of the continuation number;

NSLog (@ "%@", [String4 Substringwithrange:range]);

Nsrange Jia;

Jia.length = 5;

Jia.location = 8;

NSLog (@ "%@", [String4 Substringwithrange:jia]);

Divides a string into an array by a specified character;

Nsarray *messagelist = [String4 componentsseparatedbystring:@ ","];

Note: The comma inside "," must be the same as the comma inside the character to be split

NSLog (@ "%@", messagelist[0]);

for (id obj in messagelist) {

NSLog (@ "%@\n", obj);

}

NSString *ni = @ "The moon in front of the bed light, staring at the ground frost, Jutou look at the moon, think Home";

Nsarray *messagelist1 = [ni componentsseparatedbystring:@ ";];

NSLog (@ "%@", a);

For (ID think home in messageList1) {

NSLog (@ "%@\n", think home);

}

Convert all the English letters to uppercase;

NSString *english = @ "I study english!do you know";

NSLog (@ "%@", english.uppercasestring);

Uppercase converted to lowercase;

NSString *english1 = @ "I STUDY english! Do you KNOW ";

NSLog (@ "%@", english1.lowercasestring);

Convert to first letter capitalization;

NSLog (@ "%@", english.capitalizedstring);

The first letter of an English word is capitalized;

NSLog (@ "%@", 中文版);

stitching strings;

NSString *string5 = @ "I";

NSString *string6 = @ "hit";

NSString *string7 = @ "You";

NSString *q = [String5 Stringbyappendingstring:string6];

NSLog (@ "%@\n", Q);

NSString *w = [String5 stringbyappendingformat:@ "want to hit%@", String7];

NSLog (@ "%@", W);

/* Concatenation of immutable strings, is the original string based on the concatenation of a string to generate another new string;

The two methods of the concatenation of immutable string strings will generate a new string;

*/

query string;

Determines whether a string is contained within a string;

NSString *link = @ "Zxcbvnmkajsldhfgquwyeireotpy";

Nsrange range1 = [link rangeofstring:@ "DSA"];

NSLog (@ "%ld", Nsnotfound);

if (Range1.location!=nsnotfound) {

NSLog (@ "%@", link);

}else

NSLog (@ "no query");

/*

(Range.location!=nsnotfound) to determine whether it exists,

*/

The string begins with what;

What is contained in the header of the string;

if ([link hasprefix:@ "Zxc"]!=no) {

NSLog (@ "exists");

}else

NSLog (@ "error");

The string ends with what;

if ([link hassuffix:@ "HJ"]!=no) {

NSLog (@ "yes");

}

Else

NSLog (@ "no");

Variable string;

Replace

nsmutablestring *mustring = [[nsmutablestring alloc]initwithstring:@ "Bruse"];

Nsrange Range3;

Range3.location = 1;

Range3.length = 4;//replaces four lengths from the second position;

Replaces the string in the specified position with another string;

[Mustring replacecharactersinrange:range3 withstring:@ "Lood"];

NSLog (@ "%@", mustring);

#pragma mark-------variable string concatenation--------------

/*1, a string is added on the basis of the original string;

2, the use of variable strings, expanded out of two methods;

3. Synthesize a string (or an object of the original string) with the original string

*/

#pragma mark--------Exercise 2---------------------

nsmutablestring *ver = [[nsmutablestring alloc]initwithstring:@] I am a programmer! "];

Nsrange Range4;

Range4.location = 4;

Range4.length = 3;

[Ver replacecharactersinrange:range4 withstring:@ "Doctor"];

NSLog (@ "%@", Ver);

Deletes the information at the specified location;

Nsrange Delect;

delect.location = 0;

Delect.length = 4;

[Ver Deletecharactersinrange:delect];

NSLog (@ "%@", Ver);

Nsmutabledictionary *mud = [Nsmutabledictionary dictionary];

Nsdictionary *dic = @{@ "Ewq": @ "FRS" @ "Tre": @ "Gfdsh"};

[Mud setobject:@ "WEW" forkey:@ "DFSF"];

[Mud setobject:dic forkey:@ "qwe"];

NSLog (@ "%@", mud);

}

return 0;

}

objective-c-Use of strings