帶有UIButton的子視圖不可單擊

Question

這是我正在使用的代碼：

UIButton *mainButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[mainButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
mainButton.center = CGPointMake(self.view.frame.size.width/2.0f, self.view.frame.size.height/2.0f);
[self.view addSubview:mainButton];

UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 200, 100)];
[subView setBackgroundColor:[UIColor purpleColor]];
[mainButton addSubview:subView];

UIButton *secondButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[secondButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
secondButton.center = CGPointMake(subView.frame.size.width/2.0f, subView.frame.size.height/2.0f);
[subView addSubview:secondButton];

為什么mainButton是可單擊的，而secondButton不是可單擊的？

Answer 1

K，您應該在self.view上添加子視圖。

UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 200, 100)];
[subView setBackgroundColor:[UIColor purpleColor]];
[self.view addSubview:subView];

UIButton *secondButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[secondButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
secondButton.center = CGPointMake(subView.frame.size.width/2.0f, subView.frame.size.height/2.0f);
[subView addSubview:secondButton];
UIButton *thirdButton = [[UIButton alloc] initWithFrame:CGRectMake(100, 0, 100, 100)];
[secondButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
secondButton.center = CGPointMake(subView.frame.size.width/2.0f, subView.frame.size.height/2.0f);
[subView addSubview:secondButton];

嘗試這個。 它將在子視圖上添加兩個按鈕。

Answer 2

您不應該在UIButton中將UIView添加為子視圖

嘗試這個

UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 200, 100)];
[subView setBackgroundColor:[UIColor purpleColor]];
[self.view addSubview:subView];

UIButton *mainButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[mainButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
mainButton.center = CGPointMake(self.view.frame.size.width/2.0f, self.view.frame.size.height/2.0f);
[subView addSubview:mainButton];

UIButton *secondButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
[secondButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
[subView addSubview:secondButton];

編輯：如果您想將兩個按鈕保留在不同的視圖上，則采取兩個子視圖，然后嘗試.....

UIView *subView1 = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
[subView1 setBackgroundColor:[UIColor purpleColor]];
[self.view addSubview:subView1];

UIButton *mainButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[mainButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
[subView1 addSubview:mainButton];


UIView *subView2 = [[UIView alloc] initWithFrame:CGRectMake(0, 200, 100, 100)];
[subView2 setBackgroundColor:[UIColor purpleColor]];
[self.view addSubview:subView2];


UIButton *secondButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[secondButton setImage:[UIImage imageNamed:@"CircleShape.png"] forState:UIControlStateNormal];
[subView2 addSubview:secondButton];

Answer 3

問題是您的subView是mainButton的子級。 您應該將其添加到viewController的視圖中。