在iOS中使用JSON创建动态表单

Question

我需要使用JSON创建一个动态表单。我已经解析了JSON，但我不知道如何动态地创建表单。请建议一些代码或教程。

[
    {
        "cssClass": "head"
    },
    {
        "cssClass": "input_text",
        "values": "Text Field",
        "fieldsize": "small",
        "required": "undefined",
        "prevalue": "This is text field",
        "autocaps": "none",
        "fieldesc": "text field description"
    },
    {
        "cssClass": "number",
        "values": "Number ",
        "fieldsize": "small",
        "required": "required",
        "prevalue": "This is Number Field",
        "autocaps": "capitalize",
        "fieldesc": "number field description"
    },
    {
        "cssClass": "email",
        "values": "Email",
        "fieldsize": "small",
        "required": "required",
        "prevalue": "This is email field",
        "autocaps": "none",
        "fieldesc": "email field description"
    },
    {
        "cssClass": "password",
        "values": "Password",
        "fieldsize": "small",
        "required": "required",
        "prevalue": "password",
        "autocaps": "none",
        "fieldesc": "password field description"
    },
    {
        "cssClass": "date",
        "values": "Date",
        "fieldsize": "medium",
        "required": "required",
        "prevalue": "datefield",
        "autocaps": "uppercase",
        "fieldesc": "date field description"
    },
    {
        "cssClass": "time",
        "values": "Time",
        "fieldsize": "small",
        "required": "undefined",
        "prevalue": "time field",
        "autocaps": "uppercase",
        "fieldesc": "time field description"
    }
]

- user1190239

---

创建一个类文件，包含所有字段，并将它们存储在NSArray中，一旦从WS获取数据，将其传递给表视图并重新加载数据。 - P.J

你能提供一些相关链接或示例代码吗？ - user1190239

Answer 1

首先，您需要将JSON解析为字典，然后使用每个字典条目实例化自定义对象：

@interface FormItem : NSObject

@property (nonatomic, retain) NSString * cssClass;
@property (nonatomic, retain) NSString * values;
//etc

+(id)initWithDictionary:(NSDictionary*)dictionary;

@end

@implementation FormItem

+(id)initWithDictionary:(NSDictionary*)dictionary {
    if (self = [super init]) {
        _cssClass = [dictionary valueForKey:@"cssClass"];
        //etc
    }
}

@end

一旦您在视图控制器中拥有了NSArray中的这些对象，例如self.formItems，您将使用该列表来绑定tableView。在cellForRowAtIndexPath:中，您将想要提取该项：

FormItem *currentItem = self.formItems[indexPath.row];

在那时，您将需要动态创建UITextField或其他所需控件，并将它们添加到表格单元中：

if ([currentItem.values isEqualToString:@"Text Field"] {
    UITextField *text = [[UITextField alloc] init...];
    //setup
    [cell.contentView addSubview:text];
}

你可以将这些内容抽象到你的FormItem类中，但这是一种快速的方法。

- shawnwall