如何在滾動視圖上添加多個按鈕

Question

我想與滾動視圖一起動態地添加按鈕，假設有100個按鈕要添加到滾動視圖上，將它添加到nib文件上會是一件容易的事，所以我想知道如何編寫代碼，在滾動視圖的圖像視圖頂部動態添加按鈕

Answer 1

你需要做的是創建一個循環，創建UIButtons。設置按鈕&將它們作爲子視圖添加到UIScrollView。代碼如下。

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)]; 

我基本上這裏做的是具有X & Y座標的變量是什麼。當我循環創建UIButtons上午創建適當的CGRect結構來決定將按鈕放在UIScrollView的哪裏。將該按鈕添加到scrollView後，將Y值更改爲您想要放置下一個按鈕的位置。

最後不要忘記爲scrollview設置ContentSize，以便它能夠滾動。 PS：所有這些代碼都是自由輸入的，可能有小的語法錯誤，但是邏輯是可靠的。

Answer 2

可以使用以下代碼來對滾動視圖添加多個按鈕：

步驟1：

Delegate "UIScrollViewDelegate" to your Viewcontroller.h 

for example: 
@interface Viewcontroller : UIViewController<UIScrollViewDelegate> 

步驟2：

//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]; 

步驟3：

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); 
}