將按鈕添加到另一個下方

Question

我想添加一個在另一個下方的按鈕。我有這個簡單的代碼：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    for(int i=0 ; i<9 ; i++) 
    { 
     UIButton *myButton = [[UIButton alloc] init]; 
     myButton.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height/10); //this "10" i want also dynamically 
     myButton.backgroundColor = [UIColor blackColor]; 
     [self.view addSubview:myButton]; 
    } 

} 

當然，我知道它會畫一個在另一個。但我可以在不知道高度的循環中做到這一點（因爲高將取決於循環中將有多少個按鈕）。

我想達到的目標：

Answer 1

試試這個：

- (void)viewDidLoad 
    { 
    [super viewDidLoad]; 
    int number = 10; 

    for(int i=0 ; i<9 ; i++) 
    { 
    UIButton *myButton = [[UIButton alloc] init]; 
    myButton.frame = CGRectMake(self.view.frame.origin.x, (self.view.frame.size.height/number)*i + number, self.view.frame.size.width, self.view.frame.size.height/number); 
    myButton.backgroundColor = [UIColor blackColor]; 
    [self.view addSubview:myButton]; 
    } 


} 

Answer 2

也許，這可能會奏效？對不起，我還沒有使用self.view.frame年齡，但你得到的一般想法。

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    int number; 

    for(int i=0 ; i<9 ; i++) 
    { 
     UIButton *myButton = [[UIButton alloc] init]; 
     myButton.frame = CGRectMake(i * self.view.frame.origin.x/number, 
            self.view.frame.origin.y, 
            self.view.frame.size.width, 
            self.view.frame.size.height/number); //this "10" i want also dynamically 
     myButton.backgroundColor = [UIColor blackColor]; 
     [self.view addSubview:myButton]; 
    } 
} 

Answer 3

您需要定義按鈕的尺寸爲正確的節目，可惜沒有按鈕的大小，你不能達到你想因爲怎麼回事呢系統知道您想要顯示的按鈕大小...？

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    Float32 _spaceBetweenButtons = 8.f; 
    Float32 _offsetY = 32.f; 
    Float32 _buttonWidth = 300.f; // width fo button 
    Float32 _buttonHeight = 32.f; // height of the button 

    for (int i = 0 ; i < 9 ; i++) { 
     UIButton *_myButton = [[UIButton alloc] initWithFrame:CGRectMake(0.f, 0.f, _buttonWidth, _buttonHeight)]; 
     [_myButton setBackgroundColor:[UIColor blackColor]]; 
     [_myButton setTitle:[NSString stringWithFormat:@"button #%d", i] forState:UIControlStateNormal]; // just add some text as title 
     [self.view addSubview:_myButton]; 
     [_mybutton setCenter:CGPointMake(self.view.frame.size.width/2.f, _offsetY + i * (myButton.frame.size.height + _spaceBetweenButtons))]; 
    } 
} 

---

如果要計算動態按鈕的大小

，並要對齊按鈕的高度視圖的高度，這裏會是一個方法：

NSInteger _numberOfButtons = 20; 
Float32 _spaceBetweenButtons = 8.f; 
Float32 _calculatedHeight = (self.view.frame.size.height - (_numberOfButtons + 1 * _spaceBetweenButtons))/_numberOfButtons; 

和方法與上述方法相同，但我不確定在數百個按鈕的情況下，您將獲得良好的用戶界面。 :)