UITapGestureRecognizer not working on custom UIView class

问题

I've made a custom view class. I'm initializing it in my view controller class. I've enabled user interaction then also it's not working. I've searched it in similar questions but most of them say to enable user interaction.
Here's the code I've written.

@interface ProfileCreatorViewController (){

SectionTitleView *ProfileTitle;
CGRect mainFrame;

}

@end

@implementation ProfileCreatorViewController

- (void)viewDidLoad {
    [super viewDidLoad];


    mainFrame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + NAVBAR_HEIGHT, self.view.frame.size.width, self.view.frame.size.height);

    CGRect profileFrame = CGRectMake(mainFrame.origin.x + 5, mainFrame.origin.y, mainFrame.size.width - 20, 50);
    ProfileTitle = [[SectionTitleView alloc]initWithFrame:profileFrame withTitle:@"Profile" withUnderLineColor:[UIColor blackColor] withDownButton:[UIImage imageNamed:@"rightArrow"]];
    [self.view addSubview:ProfileTitle];

    UITapGestureRecognizer *recog = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(downButtonClicked)];
    [ProfileTitle addGestureRecognizer:recog];
    ProfileTitle.userInteractionEnabled = YES;

}


-(void) downButtonClicked{

    NSLog(@"clicked");
}

回答1:

You can check couple of things here profileFrame's height and width are not very small (print profileFrame)

ProfileTitle is not complete transparent (Gesture will also not work when view's alpha is very close to 0)

ProfileTitle is not obscured by any other view (use visual debugger for that)

回答2:

@interface ProfileCreatorViewController ()<UIGestureRecognizerDelegate>{

SectionTitleView *ProfileTitle;
CGRect mainFrame;

}

@end

@implementation ProfileCreatorViewController

- (void)viewDidLoad {
    [super viewDidLoad];


    mainFrame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + NAVBAR_HEIGHT, self.view.frame.size.width, self.view.frame.size.height);

    CGRect profileFrame = CGRectMake(mainFrame.origin.x + 5, mainFrame.origin.y, mainFrame.size.width - 20, 0);
    ProfileTitle = [[SectionTitleView alloc]initWithFrame:profileFrame withTitle:@"Profile" withUnderLineColor:[UIColor blackColor] withDownButton:[UIImage imageNamed:@"rightArrow"]];
    [self.view addSubview:ProfileTitle];

    UITapGestureRecognizer *recog = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(downButtonClicked:)];
    recog.delegate=self;
    [ProfileTitle addGestureRecognizer:recog];
    ProfileTitle.userInteractionEnabled = YES;

}


-(void) downButtonClicked:(UITapGestureRecognizer *)sender{

    NSLog(@"clicked");
}

Add a delegate and change your method signature

回答3:

Try these..

create property of your custom view like these..and also import it in your ProfileCreatorViewController.h file like these..

#import "SectionTitleView.h"

@property (nonatomic , strong) SectionTitleView *previewView;

Add UIGestureRecognizerDelegate

@interface ProfileCreatorViewController ()<UIGestureRecognizerDelegate>
{
   SectionTitleView *ProfileTitle;
   CGRect mainFrame;
}

set NumberOfTapsRequired if you want

UITapGestureRecognizer *recog = 
  [[UITapGestureRecognizer alloc]initWithTarget:self 
                                         action:@selector(downButtonClicked:)];     
ProfileTitle.userInteractionEnabled = YES;
[recog setNumberOfTapsRequired:1];  //No. of taps..
[ProfileTitle addGestureRecognizer:recog];

and also its method

-(void) downButtonClicked:(UITapGestureRecognizer*)gesture
{
    NSLog(@"Taped");
}

i hope it helps..

回答4:

You need the UIGestureRecognizerDelegate inside the header file. Also create a property to hold the UITapGestureRecognizer inside:

@property (strong, nonatomic) UITapGestureRecognizer tapGesture;

You also shouldn't create the UITapGestureRecognizer inside the parent class. The ProfileTitle should generate this by itself. So you'd better insert the code inside viewDidLoad inside SectionTitleView.

FYI: And don't use capitalized variable names

来源：https://stackoverflow.com/questions/32449919/uitapgesturerecognizer-not-working-on-custom-uiview-class

标签

ios

objective-c

uiview

uitapgesturerecognizer