通过 JSON 动态创建 ViewController

Posted 2023-03-08

【中文标题】通过 JSON 动态创建 ViewController

【英文标题】：Dynamically create ViewControllers through JSON

【发布时间】：2014-03-19 13:16:55

【问题描述】：

我正在尝试实现此代码xCode Dynamically create ViewControllers，但我不确定如何正确实现它。

我需要动态创建视图控制器，然后动态地将按钮添加到这些视图控制器，然后最终使这些按钮在单击时转到那些视图控制器。

首先，我创建了一个“单一视图项目”，然后在 viewController.m 文件中，我在 (void)viewDidLoad 之后添加了以下代码。

/// DATA JSON ADDED TO NSMutableDictionary ...
NSMutableDictionary * allContent = [NSJSONSerialization
JSONObjectWithData:allContentData
options:NSJSONReadingMutableContainers
error:&error];
//// GO THROUGH DATA
if( error )

    NSLog(@"%@", [error localizedDescription]);

else 
//// CONTROLLERS
NSArray *xControllers = allContent[@"xControllers"];
NSMutableArray *viewControllers = [[NSMutableArray alloc] initWithCapacity:0];
for ( NSDictionary *theConDetails in xControllers )

UIViewController * vc = [[UIViewController alloc] init];
vc.view.backgroundColor = [UIColor redColor];
[viewControllers addObject:vc];

//// BUTTONS
NSArray *xButtons = allContent[@"xButtons"];
for ( NSDictionary *theButtonsDetails in xButtons )

NSString *xLabel = [NSString stringWithFormat:@"%@",theButtonsDetails[@"Label"]];
xPositionX = [theButtonsDetails[@"PositionX"]intValue];
xPositionY = [theButtonsDetails[@"PositionY"]intValue];
xWidth = [theButtonsDetails[@"Width"]intValue];
xHeight = [theButtonsDetails[@"Height"]intValue];
xZorder = [theButtonsDetails[@"Z_Order"]intValue];
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
myButton.frame = CGRectMake(xcoPositionX, xcoPositionY, xcoWidth, xcoHeight);
[myButton setTitle:xcoLabel forState:UIControlStateNormal];
[myButton addTarget:self action:@selector(HOW DO i CONNECT THE BUTTON TO GO TO VIEW CONTROLLER:) forControlEvents:UIControlEventTouchUpInside];

[self.view insertSubview:myButton atIndex:xcoZorder];

我的 JSON 数据：

    
xControllers: [

id: "1",
Name: "Screen 1",
Is_First: "Yes" <- MAKE THIS THE FIRST VIEW CONTROLLER
,

id: "2",
Name: "Screen 2",
Is_First: "No"

],
xButtons: [

id: "1",
Name: "Next",
Label: "Next",
View: "1", <- DISPLAY ON VIEW CONTROLLER
Link: "2", <- LINK TO VIEW CONTROLLER
PositionX: "0",
PositionY: "0",
Width: "100",
Height: "100",
Z_Order: "56",
,

id: "2",
Name: "Back",
Label: "Back",
View: "2",  <- DISPLAY ON VIEW CONTROLLER
Link: "1", <- LINK TO VIEW CONTROLLER
PositionX: "0",
PositionY: "0",
Width: "100",
Height: "100",
Z_Order: "56",

]

我的帮助将不胜感激。一个多星期以来，我一直在努力解决这个问题。

【参考方案1】：

一种可能是设置Tag属性并使用该属性获取对应的控制器表单数组：

...
...
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
myButton.frame = CGRectMake(xcoPositionX, xcoPositionY, xcoWidth, xcoHeight);
[myButton setTitle:xcoLabel forState:UIControlStateNormal];
[myButton setTag:[theButtonsDetails[@"id"]intValue]];  // <---- See this line
[myButton addTarget:self action:@selector(someButtonTouchEvent:) forControlEvents:UIControlEventTouchUpInside];
...
...
-(IBAction)someButtonTouchEvent:(id)sender

    [self.navigationController pushViewController:viewControllers[((UIButton*)sender).tag] animated:YES];

【讨论】：

谢谢 NeverHopeless。这听起来是个好主意。

NeverHopeless 我是新手，对不起，我收到有关此 IBAction 代码 viewControllers[((UIButton*)sender).tag 的此错误 - 错误显示“使用未声明的标识符 'viewController'：你意思是“UIViewControllers”？

对不起，我解决了这个错误。我没有在 .h 文件中声明数组。

但是现在代码在 [viewControllers addObject:vc] 处中断；

错误是什么？为什么要初始化容量为 0 的数组？尝试使用NSMutableArray *viewControllers = [[NSMutableArray alloc] init] 或NSMutableArray *viewControllers = [NSMutableArray array]，看看你会得到什么..

【参考方案2】：

我已经修改了你的代码，我可以在视图中读取 JSON 文件

for (NSDictionary *theButtonsDetails in xButtons )

        NSString * xLabel = [NSString stringWithFormat:@"%@",theButtonsDetails[@"Label"]];
        NSString * xPositionX = [NSString stringWithFormat:@"%@",theButtonsDetails[@"PositionX"]];
        NSString *  xPositionY = [NSString stringWithFormat:@"%@",theButtonsDetails[@"PositionY"]];
        NSString *  xWidth = [NSString stringWithFormat:@"%@",theButtonsDetails[@"Width"]];
        NSString *  xHeight = [NSString stringWithFormat:@"%@",theButtonsDetails[@"Height"]];

    UIButton * myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    myButton.frame = CGRectMake([xPositionX doubleValue], [xPositionY doubleValue], [xWidth doubleValue], [xHeight doubleValue]);
    [myButton setTitle:xLabel forState:UIControlStateNormal];
    myButton.backgroundColor = [ UIColor grayColor];
    [myButton setTag:[theButtonsDetails[@"id"]intValue]];
    [myButton addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview: myButton];

我替换了 NSString 而不是 NSInteger。