Question

我有一个UIScrollView，我创建了两个UIButtons。第一个按钮按预期工作，但第二个按钮消失。它仍然存在并且可以接受点击，并且当您单击隐藏按钮时变为可见。

关于为什么出现第二个按钮的任何想法？

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];


button_1        = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];

button_1.titleLabel.font                          = [UIFont systemFontOfSize:12];;
button_1.titleLabel.lineBreakMode         = UILineBreakModeTailTruncation;
button_1.contentVerticalAlignment         = UIControlContentVerticalAlignmentCenter;
button_1.contentHorizontalAlignment       = UIControlContentHorizontalAlignmentCenter;

[button_1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button_1 setTitle:@"Circle" forState:UIControlStateNormal];            
button_1.frame = CGRectMake(0.0, 30.00, 50, 20);    
[button_1 addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button_1];


button_2        = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];

button_2.titleLabel.font                          = [UIFont systemFontOfSize:12];;
button_2.titleLabel.lineBreakMode         = UILineBreakModeTailTruncation;
button_2.contentVerticalAlignment         = UIControlContentVerticalAlignmentCenter;
button_2.contentHorizontalAlignment       = UIControlContentHorizontalAlignmentCenter;

[button_2 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button_2 setTitle:@"Square" forState:UIControlStateNormal];            
button_2.frame = CGRectMake(0.0, 120.0, 50, 20);    
[button_2 addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button_2];

Answer 1

你想在这里实现的布局是什么？默认情况下，表格单元格（除非您有自定义rowHeights） 44px高。你的button_2将远离单元格边界，远远低于第一个按钮。此外，没有理由，实际上你不应该保留你正在创建的按钮。将它们添加到父视图时，它们将被保留。

UIScrollView和UIButton，UIButtons消失

1 个答案: