在网格视图中按下了哪个按钮

Question

Evening All

I have the following code to fill in a grid of buttons, but how do I detect which button has been selected and pass the button image on another controller

i =0; 
int i1=0; 
while(i<n){ 
int yy = 4 +i1*79; 
for(int j=0; j<4;j++){ 
if (i>=n) break; 
CGRect rect; 
rect = CGRectMake(4+79*j, yy, 75, 75); 
UIButton *button=[[UIButton alloc] initWithFrame:rect]; 
[button setFrame:rect]; 

id item = [items objectAtIndex:i]; 
NSString *imageLink = [item objectForKey:@"link"]; 

UIImage *buttonImageNormal=[UIImage imageWithData: [NSData dataWithContentsOfURL: [NSURLURLWithString: imageLink]]]; 

[button setBackgroundImage:buttonImageNormal forState:UIControlStateNormal]; 
button.tag =i; 
NSLog(@"index: %i", i); 
[button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside ];

Thanks in advance

Answer 1

You will obtain pressed button as an argument to the callback method (buttonPressed:). Just implement it in such manner:

- (void)buttonPressed:(UIButton *)senderButton {

    UIImage *image = [senderButton backgroundImageForState:UIControlStateNormal];
    //use image:)
}

Answer 2

You could give each button a tag, and then use the -(void)buttonPressed: posted earlier. With that function, you could do something like:

- (void)buttonPressed:(UIButton *)senderButton 
{
    if (senderButton.tag == 0) {
         // perform segue
    } else if (senderButton.tag == 1) {
         // perform other segue
    }
}

And so on, and so forth.

I hope that helps!