iOS Country City Selector read local JSON file

Recently in the product has such a demand, read the local JSON file of the country and city information, displayed on the Pickerview, on-line check, found that there is no suitable resources available, so they wrote a simple demo.

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Here's how to read local JSON:

+ (Nsmutablearray *) getcitydata{    Nsarray *jsonarray = [[Nsarray alloc]init];    NSData *filedata = [[NSData alloc]init];    Nsuserdefaults *ud = [Nsuserdefaults standarduserdefaults];    if ([UD objectforkey:@ "city"] = = nil) {        nsstring *path;        Path = [[NSBundle mainbundle] pathforresource:@ "ZH_CN" oftype:@ "json"];        FileData = [NSData Datawithcontentsoffile:path];                [UD setobject:filedata forkey:@ "City"];        [UD synchronize];    }    else {        FileData = [UD objectforkey:@ "City"];    }    Nsmutablearray *array = [[Nsmutablearray alloc]initwithcapacity:0];    Jsonarray = [nsjsonserialization jsonobjectwithdata:filedata options:nsjsonreadingmutableleaves Error:nil];    For (Nsdictionary *dict in Jsonarray) {        [array addobject:dict];    }        return array;}

Citypicker main code is as follows:

Returns the number of columns displayed-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) pickerview{if (Pickerview = = Self.citypicker) {    return 3; } else return 1;} Returns the number of rows displayed in the current column-(Nsinteger) Pickerview: (Uipickerview *) Pickerview numberofrowsincomponent: (Nsinteger) component{if (CO    Mponent = = 0) {return [ymutils getcitydata].count;        } else if (component = = 1) {Nsarray *array = [ymutils getcitydata][row1][@ "Children"];        if ((nsnull*) Array! = [NSNull null]) {return array.count;    } return 0;        } else {Nsarray *array = [ymutils getcitydata][row1][@ "Children"]; if ((nsnull*) Array! = [NSNull null]) {Nsarray *array1 = [ymutils getcitydata][row1][@ "Children"][row2][@ "child            Ren "];            if (nsnull*) array1! = [NSNull null]) {return array1.count;        } return 0;    } return 0; }}//set the contents of the current line-(NSString *) Pickerview: (Uipickerview *) Pickerview Titleforrow: (NSINteger) Row forcomponent: (Nsinteger) component{if (component = = 0) {return [ymutils getcitydata][row][@ "name"    ];    } else if (component = = 1) {return [ymutils getcitydata][row1][@ "Children"][row][@ "name"];    } else if (component = = 3) {return [ymutils getcitydata][row1][@ "Children"][row2][@ "Children"][row][@ "name"];    } return nil; }//selected number of rows-(void) Pickerview: (Uipickerview *) Pickerview Didselectrow: (nsinteger) Row incomponent: (Nsinteger) component        {if (component = = 0) {row1 = row;        Row2 = 0;        row3 = 0;        [Self.citypicker reloadcomponent:1];            [Self.citypicker Reloadcomponent:2];        } else if (component = = 1) {row2 = row;        row3 = 0;            [Self.citypicker Reloadcomponent:2];    } else {row3 = row;    } Nsinteger cityRow1 = [Self.citypicker selectedrowincomponent:0];    Nsinteger cityRow2 = [Self.citypicker selectedrowincomponent:1]; Nsinteger CITYROW3 = [Self.citypIcker Selectedrowincomponent:2];    nsmutablestring *str = [[nsmutablestring alloc]init];    [Str appendstring:[ymutils getcitydata][cityrow1][@ "name"];    Nsarray *array = [ymutils getcitydata][cityrow1][@ "Children"]; if ((nsnull*) Array! = [NSNull null]) {[str appendstring:[ymutils getcitydata][cityrow1][@ "Children"][cityrow2][@ "n        Ame "]);        Nsarray *array1 = [ymutils getcitydata][cityrow1][@ "Children"][cityrow2][@ "children"]; if (nsnull*) array1! = [NSNull null]) {[str appendstring:[ymutils getcitydata][cityrow1][@ ' children '][cityrow2        ][@ "Children"][cityrow3][@ "name"]; }} self.cityLabel.text = str;} Text style displayed per line-(UIView *) Pickerview: (Uipickerview *) Pickerview Viewforrow: (nsinteger) Row forcomponent: (Nsinteger) Component Reusingview: (UIView *) view{UILabel *titlelabel = [[UILabel alloc] Initwithframe:cgrectmake (0, 0, 107, 30    )];    Titlelabel.textalignment = Nstextalignmentcenter;    Titlelabel.font = [Uifont systemfontofsize:14];Titlelabel.backgroundcolor = [Uicolor Clearcolor];    if (component = = 0) {Titlelabel.text = [ymutils getcitydata][row][@ "name"];    } else if (component = = 1) {titlelabel.text = [ymutils getcitydata][row1][@ "Children"][row][@ "name"];    } else {titlelabel.text = [ymutils getcitydata][row1][@ "Children"][row2][@ "Children"][row][@ "name"];    } return Titlelabel; }

Demo: http://download.csdn.net/detail/u011918080/8200985

iOS Country City Selector read local JSON file