Question

我希望动态添加按钮以及scrollview，假设在scrollview上添加了100个按钮，将它添加到nib文件上会非常棒，所以我想知道如何编写代码，动态添加按钮在scrollview上的图像视图顶部

Answer 1

您需要做的是创建一个循环，创建UIButtons。设置按钮＆amp;将它们作为子视图添加到UIScrollView。代码如下。

NSUInteger i;
int xCoord=0;
int yCoord=0;
int buttonWidth=100;
int buttonHeight=50;
int buffer = 10;
for (i = 1; i <= 100; i++)
{
    UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];
    aButton.frame     = CGRectMake(xCoord, yCoord,buttonWidth,buttonHeight );
    [aButton addTarget:self action:@selector(whatever:) forControlEvents:UIControlEventTouchUpInside];
    [scrollView addSubview:aButton];

    yCoord += buttonHeight + buffer;
}
[scrollView setContentSize:CGSizeMake(700, yCoord)];

我在这里基本上做的是为X＆amp; Y坐标。当我循环创建UIButtons时，创建适当的CGRect结构来决定将按钮放在UIScrollView中的位置。将该按钮添加到scrollView后，更改X＆amp; Y值指向您要放置下一个按钮的位置。

最后不要忘记为scrollview设置ContentSize，以便滚动。

PS：所有这些代码都是自由输入的，可能有小的语法错误，但逻辑是稳定的。

Answer 2

您可以使用以下代码在scrollview上添加多个按钮：

第1步：

Delegate "UIScrollViewDelegate" to your Viewcontroller.h

for example:
 @interface Viewcontroller : UIViewController<UIScrollViewDelegate>

第2步：

//create you UIScrollView
UIScrollView  *Scroll_View= [[UIScrollView alloc]initWithFrame:CGRectMake(0 ,0 ,self.view.frame.size.width ,self.view.frame.size.height-0)];
Scroll_View.delegate= self;
self.automaticallyAdjustsScrollViewInsets= NO;
Scroll_View.backgroundColor= [UIColor clearColor];
Scroll_View.scrollEnabled= YES;
Scroll_View.userInteractionEnabled= YES;
[Scroll_View setShowsHorizontalScrollIndicator:NO];
[Scroll_View setShowsVerticalScrollIndicator:YES];
[self.view addSubview:Scroll_View];

第3步：

NSArray  *optionsAry= [NSArray arrayWithObjects:@"My Profile & My Orders" ,@"Track Order" ,@"Settings" ,@"Contact Us" ,@"About Us" ,@"Terms & Conditions" ,@"Currency Converter" ,@"System Info" ,@"e-Commerce News App (News Billa)" ,@"Social Media" ,nil];

int y= 20;
for(int i=0; i<optionsAry.count; i++){
    UIButton  *BTN_For_More= [[UIButton alloc] initWithFrame:CGRectMake(20 ,y , Scroll_View.frame.size.width-40 ,35)];
    BTN_For_More.tag= i;
    BTN_For_More.backgroundColor= [UIColor whiteColor];
    [BTN_For_More addTarget:self action:@selector(BTN_For_More_Action:) forControlEvents:UIControlEventTouchUpInside];
    BTN_For_More.titleLabel.text= [NSString stringWithFormat:@"%@",[optionsAry objectAtIndex:i]];
    BTN_For_More.titleLabel.textColor= [UIColor colorWithRed:12/255.0 green:104/255.0 blue:172/255.0 alpha:1.0f];
    BTN_For_More.titleLabel.textAlignment= NSTextAlignmentCenter;
    BTN_For_More.titleLabel.font= [UIFont fontWithName:@"SourceSansPro-Regular" size:15];
    //3D effects Start
    BTN_For_More.layer.shadowColor= [UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.5f].CGColor;
    BTN_For_More.layer.shadowOffset= CGSizeMake(0 ,0);//2,2
    BTN_For_More.layer.shadowRadius= 2.0;
    BTN_For_More.layer.shadowOpacity= 1.0;
    BTN_For_More.layer.masksToBounds= NO;
    //3D effects End


    [Scroll_View addSubview:BTN_For_More];

    y= BTN_For_More.frame.size.height + y + 20;
}//for loop END //10

Scroll_View.contentSize= CGSizeMake(Scroll_View.frame.size.width ,y);

第4步：

-(void) BTN_For_More_Action:(NSString *)myString{
   NSLog(@"you clicked on button %@", myString);
}

如何在scrollview上添加多个按钮

2 个答案: