的UIButton用的CGRect沒有出現在UIScrollView中

Question

- (CGPoint)getImageOrigin:(NSInteger)imageNumber { 
CGFloat leftInset = 40; 
CGFloat xOffsetBetweenOrigins = 100; 
CGFloat topInset = 40; 
CGFloat yOffsetBetweenOrigins = 100; 
int numPerRow = 3; 
CGFloat x = leftInset + (xOffsetBetweenOrigins * (imageNumber % numPerRow)); 
CGFloat y = topInset + (yOffsetBetweenOrigins * floorf(imageNumber/numPerRow)); 
CGPoint imageOrigin = CGPointMake(x, y); 
return imageOrigin; 
} 

-(void)viewDidLoad{ 
UIButton *zenbutton2 =[UIButton buttonWithType:UIButtonTypeCustom]; 
CGRect newFrame = zenbutton2.frame; 
newFrame.origin = [self **getImageOrigin**:i]; 
zenbutton2.frame = newFrame; 
[scrollView addSubview:zenbutton2]; 
} 

跟着方法在這裏：laying out images in UIScrollView automatically

但我的UIButton犯規出現在我的滾動視圖，任何想法，爲什麼？

Answer 1

您的UIButton屬於UIButtonTypeCustom。所以你應該設置背景顏色或圖像來查看按鈕。

[button setImage:[UIImage imageNamed:@"btn.png"] forState:UIControlStateNormal]; 

或

button.backgroundColor = [UIColor redColor] 

試試這個。

Answer 2

您需要在添加按鈕之後設置scrollVew的內容大小。