Question

在实现文件中出现错误（“switchChanged”未声明），但无法找到问题。你能救我吗？

TIA

ViewController.m

#import "Control_FunViewController.h"



@implementation Control_FunViewController

@synthesize nameField;
@synthesize numberField;
@synthesize sliderLabel;
@synthesize leftSwitch;
@synthesize rightSwitch;
@synthesize doSomethingButton;

-(IBAction)sliderChanged:(id)sender
{
    UISlider *slider = (UISlider *)sender;
    int progressAsInt = (int)(slider.value + 0.5f);
    NSString *newText = [[NSString alloc] initWithFormat:@"%d",progressAsInt];
    sliderLabel.text = newText;
    [newText release];
}

-(IBAction)textFieldDoneEditing:(id)sender
{
    [sender resignFirstResponder];
}

-(IBAction)backgroundTap:(id)sender
{
    [nameField resignFirstResponder];
    [numberField resignFirstResponder];
}

-(IBAction)toggleControls:(id)sender
{
    if ([sender selectedSegmentIndex] == kSwitchesSegmentIndex)
    {
        leftSwitch.hidden = NO;
        rightSwitch.hidden = NO;
        doSomethingButton.hidden = YES;
    }
    else {
        leftSwitch.hidden =YES;
        rightSwitch.hidden =YES;
        doSomethingButton.hidden = NO;
    }
-(IBAction)switchChanged:(id)sender
    {
        UISwitch *whichSwitch = (UISwitch *)sender;
        BOOL setting = whichSwitch.isOn;
        [leftSwitch setOn:setting animated:YES];
        [rightSwitch setOn:setting animated:YES];
    }
-(IBAction)buttonPressed
    {
        //TODO: Implement Action Sheet and Alert
    }
}





/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}
*/

/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/


/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/


/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [nameField release];
    [numberField release];
    [sliderLabel release];
    [leftSwitch release];
    [rightSwitch release];
    [doSomethingButton release];
     [super dealloc];
}

@end

ViewController.h

#import <UIKit/UIKit.h>

#define kSwitchesSegmentIndex   0

@interface Control_FunViewController : UIViewController {
    UITextField *nameField;
    UITextField *numberField;
    UILabel *sliderLabel;
    UISwitch *leftSwitch;
    UISwitch *rightSwitch;
    UIButton *doSomethingButton;
}

@property(nonatomic,retain)IBOutlet UITextField *nameField;
@property(nonatomic,retain)IBOutlet UITextField *numberField;
@property(nonatomic,retain)IBOutlet UILabel *sliderLabel;
@property(nonatomic,retain)IBOutlet UISwitch *leftSwitch;
@property(nonatomic,retain)IBOutlet UISwitch *rightSwitch;
@property(nonatomic,retain)IBOutlet UIButton *doSomethingButton;

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


@end

Answer 1

冒号（:)是方法名称的一部分，但您没有将其包含在错误消息中。你可能只是忘了，但是如果你从某个地方调用-switchChanged（没有冒号），或者你使用动作-switchChanged（没有冒号）连接控件，那就是问题所在。也许您稍后添加了冒号和发件人参数？

需要帮助调试switchChanged方法

1 个答案: