Question

我对ios开发相当新，并且按照“开始ios5开发”一书的第4章的教程练习，我的代码遇到了一些编译错误。

这是我的标题代码.h文件的样子

   #import <UIKit/UIKit.h>

   @interface BIDViewController : UIViewController

   @property (strong, nonatomic) IBOutlet UITextField *namefIELD;

   @property (strong, nonatomic) IBOutlet UITextField *numberField;
   @property (strong, nonatomic) IBOutlet UILabel *sliderLabel;
   @property (strong, nonatomic) IBOutlet UISegmentedControl *leftSwitch;
   @property (strong, nonatomic) IBOutlet UISegmentedControl *rightSwitch;
   @property (strong, nonatomic) IBOutlet UIButton *doSomethingButton;

   -(IBAction)textFieldDoneEditing:(id)sender;
   //to initialize the 'done' button when editing to confirm you have finished editing/

   -(IBAction) backgroundTap:(id)sender;
  - (IBAction)sliderChanged:(id)sender;
  - (IBAction)switchChanged:(id)sender;
  - (IBAction)toggleControls:(id)sender;
  - (IBAction)buttonPressed:(id)sender;
  @end

这里是我的.m代码，其中im面临错误“没有可见@interface for'UISegmentedControl'声明了选择器'setOn：animated;'

  @synthesize leftSwitch;
  @synthesize rightSwitch;


 - (IBAction)switchChanged:(id)sender {
 UISwitch *whichSwitch = (UISwitch *)sender;
 BOOL setting = whichSwitch.isOn;
 [leftSwitch setOn: setting animated: YES];  //the error lies here/
 [rightSwitch setO: setting animated: YES];  //the error lies here/
 }

 - (IBAction)toggleControls:(id)sender {
 }

 - (IBAction)buttonPressed:(id)sender {
 }
 @end

错误语句是“没有可见的@interface for'UISegmentedControl”声明了选择器'setOn：animated;'

请帮助，这将受到高度赞赏和投票：）

@PhilipMills ...这就是我所说的，只要点击分段控制对象的左侧或右侧，我的委托标题代码就会自动产生断点

 #import <UIKit/UIKit.h>

 #import "BIDAppDelegate.h"

 int main(int argc, char *argv[])
 {
       @autoreleasepool {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([BIDAppDelegate         class])); //the breakpoint appears here.
       }
 }

Answer 1

UISwitch有一个setOn:animated:方法，但UISegmentedControl没有。我猜您已将对象分配给leftSwitch和rightSwitch，这些对象不是您想要的那种（或教程的目的）。

构建项目时声明接口错误

1 个答案: