UIButton在UIScrollView內部不起作用

Question

我有一個scrollview，其中我以編程方式創建按鈕。 觸摸時，按鈕應該加載另一個筆尖。 問題是，在觸摸時，我正在獲取[ViewController buttonTest]：無法識別的選擇器發送到實例

讓我來看一下代碼：

appdelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *viewController;

appdelegate.m

#import "ViewController.h"
@implementation AppDelegate 
@synthesize window = _window;
@synthesize viewController = _viewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    ViewController *view = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.viewController = [[UINavigationController alloc] initWithRootViewController:view];
    self.window.rootViewController = self.viewController;
    [application setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
    [self.window makeKeyAndVisible];
    return YES;
}

Viewcontroller.h

@class newView;

@interface ViewController : UIViewController{

    UIScrollView * scrollView;
    IBOutlet UIButton *btn;

}

- (IBAction)butttonTest:(id)sender;
    @property (strong, nonatomic) newView *secondView;

最后是ViewController.m

- (void)loadView {

    CGRect fullScreenRect=[[UIScreen mainScreen] applicationFrame];
    scrollView=[[UIScrollView alloc] initWithFrame:fullScreenRect];
    scrollView.contentSize=CGSizeMake(320,960);
    UIImageView *tempImageView2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image.jpeg"]];

    UIImage * buttonImage = [UIImage imageNamed:@"contentlist_active.png"];

    self.view=scrollView;
    [scrollView addSubview:tempImageView2];
    scrollView.userInteractionEnabled = YES;
    btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(22, 100, 277, 32);
    [btn setBackgroundImage:buttonImage forState:UIControlStateNormal];
    [btn setTitle:@"hello world" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    [btn addTarget:self action:@selector(buttonTest:) forControlEvents:UIControlEventTouchUpInside];

    [scrollView addSubview:btn];

}

要加載視圖，我有代碼：

[btn addTarget:self action:@selector(buttonTest) forControlEvents:UIControlEventTouchUpInside];

我究竟做錯了什么？

哦，是的，這是buttenPressed的方法

- (IBAction)butttonTest:(id)sender {
self.secondView = [[newView alloc] initWithNibName:@"newView" bundle:nil];

[self.navigationController pushViewController:self.secondView animated:YES];

}

Answer 1

您的方法稱為- (IBAction)butttonTest:(id)sender 。 三個t和一個參數。

但是您的選擇器是@selector(buttonTest) 。 兩t ，無參數。

這兩個方法簽名不匹配。

更改addTarget:action:forControlEvents:調用：

[btn addTarget:self action:@selector(butttonTest:) forControlEvents:UIControlEventTouchUpInside];

或刪除兩者的第三個t。

Answer 2

您是否實現了buttonTest：方法（因為我在上面的代碼中沒有看到它）？

Answer 3

嘗試這個：

[btn addTarget:self action:@selector(buttonTest:) forControlEvents:UIControlEventTouchUpInside];

注意buttonTest:而不是buttonTest 。