Question

我在视图上创建了一个UIButton，并且在UIButton [UIButton * button1_obj]的操作上，在同一视图上创建了另一个按钮[UIButton * button2_obj]。

我正面临这两个问题......请指导我如何继续。

当我运行我的项目时，button1_obj出现，但没有被点击或突出显示，也没有抛出任何异常。
在button1_obj的操作中，button2-obj必须出现在同一视图上，如何在将button2_obj放在其上之前清除视图。

问题代码（1）：

-(void)start

{

NSLog(@"--------------------------------------------------------------------");

NSLog(@"Entered CView start");

    //define size and position of view 
    subMainView_G_obj = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 480, 320)]; //initilize the view 
    //subMainView_G_obj.autoresizesSubviews = YES;              //allow it to tweak size of elements in view 

    UIButton_G_obj = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];    
    UIButton_G_obj.frame = CGRectMake(100,70, 150, 50);
    UIButton_G_obj.backgroundColor = [UIColor clearColor];
    //UIButton_G_obj.adjustsImageWhenHighlighted = YES;
    [UIButton_G_obj setTitle:@"UI" forState:UIControlStateNormal];
    [UIButton_G_obj addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
    [subMainView_G_obj addSubview:UIButton_G_obj];

    UIButton_G_obj = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];    
    UIButton_G_obj.frame = CGRectMake(100,150, 150, 50);
    UIButton_G_obj.backgroundColor = [UIColor clearColor];
    UIButton_G_obj.adjustsImageWhenHighlighted = YES;
    [UIButton_G_obj setTitle:@"Configuration" forState:UIControlStateNormal];
    [UIButton_G_obj addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
    [subMainView_G_obj addSubview:UIButton_G_obj];

    NSLog(@"Leaving CView start");
    NSLog(@"--------------------------------------------------------------------");
}

- (void)action:(id) sender
{

    NSLog(@"Inside action method.. On click of First View");
    buttonUIObj = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];   
    buttonUIObj.frame = CGRectMake(100,160,100,50);
    [buttonUIObj setTitle:@"Next View" forState:UIControlStateNormal];
    buttonUIObj.backgroundColor = [UIColor clearColor];
    [subMainView_G_obj addSubview:buttonUIObj];

}

我已经宣布了UIButton_G_obj，buttonUIObj，subMainView_G_obj GLOBALLY。

Answer 1

很难知道button1_obj的问题是什么，没有看到代码。但是，对于（2），您可能希望通过调用[button1_obj removeFromSuperview]来删除button1_obj。

Answer 2

关于问题1：首先，两个按钮的名称相同。因此，您有内存泄漏，因为您为按钮分配了两次空间。为按钮使用不同的名称。

关于问题2：您可以隐藏按钮2，直到按下按钮1：在-(void)start

UIButton_G_obj_1.tag = 1;
...
UIButton_G_obj_2.hidden = YES;
UIButton_G_obj_2.tag = 2;

在操作方法中，您可以取消隐藏按钮：

if (sender.tag == 1) {
    UIButton_G_obj_2.hidden = NO;
}

在iPhone编程中没有点击UIButton

2 个答案: