带有CGRect的UIButton不会出现在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];  
}

遵循此处的方法：laying out images in UIScrollView automatically

但是我的UIButton没有出现在我的uiscrollView中，任何想法为什么？

Answer 1

您的UIButton属于UIButtonTypeCustom。因此，您应该设置背景颜色或图像以查看按钮。

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

或

button.backgroundColor = [UIColor redColor]

试试这个。

Answer 2

添加按钮后，您需要设置scrollVew的内容大小。