IOS Verbs explained

1, Nspredicate

(1) Comparison operators

1. Compare operators >, <, = =, >=, <=,! =

Operators can also use,&& with logical operators, | | , and, OR predicates are case insensitive

Nspredicate *p = [nspredicate predicatewithformat:@ "Age >= && name = ' Week Week '"];

Returns an array of responses based on predicate requirements

Nsarray * personlist = [self.datalist filteredarrayusingpredicate:p];

[Self.datalist Filterusingpredicate:p];

(2) Range operator

In: equals the in operation of SQL, the left expression must appear in the collection specified on the right.

Between: The expression on the left is equal to the value of the right expression or between them, and to the right is a sequence of numbers with two specified upper and lower bounds (number of sequences in the specified order)

Nspredicate * p = [nspredicate predicatewithformat:@ "age between {30,60}"];

Nsarray * personlist = [self.datalist filteredarrayusingpredicate:p];

(3) tail-tracking

Start with XX--beginswith

End With XX--endswith

Nspredicate * p = [nspredicate predicatewithformat:@ "name Beginswith ' big ' | | name ENDSWITH%@", @ "dew"];

Nsarray * personlist = [self.datalist filteredarrayusingpredicate:p];

(4) Include query

Contains contains: The expression on the left contains the expression on the right.

Nspredicate * p = [nspredicate predicatewithformat:@ "%K CONTAINS%@", @ "name", @ "Huan"];

Nspredicate * p = [nspredicate predicatewithformat:@ "%K CONTAINS ' Huan '", @ "name"];

Nsarray * personlist = [self.datalist filteredarrayusingpredicate:p];

(5) Fuzzy query

Like: The expression on the left equals the right expression

* Denotes 0 or more characters

? Represents a character

Nspredicate * p = [nspredicate predicatewithformat:@ "name like ' * Huan * '"];

Nspredicate * p = [nspredicate predicatewithformat:@ "name like ' Huan * '"];

Nsarray * personlist = [self.datalist filteredarrayusingpredicate:p];

(6) Query the string itself

The string itself is queried, and each item in the array is a string in order to query with self

Nsarray * names = @[@ "Big Huan", @ "Week Week", @ "Dew dew", @ "Rice rice", @ "Huan elder brother"];

Nspredicate * p = [Nspredicate predicatewithformat:@ "self = ' great Huan '"];

Nspredicate * p = [nspredicate predicatewithformat:@ "Self CONTAINS%@", @ "Huan"];

Nsarray * personlist = [names Filteredarrayusingpredicate:p];

(7) Regular expression: MATCHES

NSString *pattern = @ "^ ((13[0-9]) | ( 15[^4,\\D]) | (18[0,0-9])) \\d{8}$ ";

Nspredicate * p = [nspredicate predicatewithformat:@ "Self MATCHES%@", pattern];

predicate in which an object is passed in to match a regular expression

BOOL istelnumber = [P evaluatewithobject:@ "118260930"];

if (Istelnumber) {

NSLog (@ "mobile phone number");

} else {

NSLog (@ "Not mobile phone number");

}

2. Uisearchcontroller Search Controller

(1) The first form of

Create a table controller that accepts results and shows

Searchresultviewcontroller * RESULTVC = [[Searchresultviewcontroller alloc] initwithstyle:uitableviewstyleplain];

Creating a Search Controller

Uisearchcontroller * SEARCHVC = [[Uisearchcontroller alloc] INITWITHSEARCHRESULTSCONTROLLER:RESULTVC];

Set up data Update Agent

Searchvc.searchresultsupdater = self;

Use modal view to jump to the search controller

[Self PRESENTVIEWCONTROLLER:SEARCHVC animated:yes completion:nil];

Get the input text through Searchbar

NSString * searchstring = SearchController.searchBar.text;

Filter search Content

[Self updatefiltercontent:searchstring];

Self.resultlist already have the value of the search.

Determine if Searchcontroller exists Searchresultscontroller

if (Searchcontroller.searchresultscontroller) {

Get the Searchresultviewcontroller reference by Searchresultscontroller

Searchresultviewcontroller * SEARCHRESULTVC = (Searchresultviewcontroller *) Searchcontroller.searchresultscontroller;

Assigning a data source to a search results controller

Searchresultvc.searchresults = self.resultlist;

Refresh the search Results Controller table

[Searchresultvc.tableview Reloaddata];

-(void) Updatefiltercontent: (NSString *) searchstring {

[C] Case insensitive

Nspredicate * p = [nspredicate predicatewithformat:@ "self contains[c]%@", searchstring];

Self.resultlist = [Self.datalist filteredarrayusingpredicate:p];

}

(2) The second form of

#warning be sure to set the Uisearchcontroller object as a global variable

Self.tableView.tableHeaderView = Self.searchVC.searchBar;

and place the button response event in the Viewdidload

IOS Verbs explained