在Xcode中將UIButton分配給UIView

Question

在我的項目中，我出於以下目的使用了以下代碼，並且該代碼正常工作。 我的代碼：

 UIView *view = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",index]]] autorelease];

view.frame = CGRectMake(70, 80, 180, 260);
return view;

但是在這里我想使用UIButton而不是UIImageView，所以我用以下代碼替換了上面代碼的第一行：

  UIView *view=[[UIButton alloc] setBackgroundImage:(UIImage *)[scrollImages objectAtIndex:index] forState:UIControlStateNormal];

但是在這一點上我收到一條錯誤消息

“使用不兼容類型'void'的表達式初始化'UIView * _strong'”。

任何人都可以通過將UIImageView替換為UIButton來幫助我解決此問題。

Answer 1

通過“ alloc”創建UIButton實例后，應將其init

UIButton *button = [[UIButton alloc] init];
[button setBackgroundImage:(UIImage *)[scrollImages objectAtIndex:index] forState:UIControlStateNormal];
UIView *view = button;

You must use an init... method to complete the initialization process

- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state返回任何值（void），這肯定是與UIView不兼容的類型。

Answer 2

像這樣...

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self action:@selector(pressed:) forControlEvents:UIControlEventTouchUpInside];

UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",index]];
[button setImage:image forState:UIControlStateNormal];
button.frame = CGRectMake(70, 80, 180, 260);
[self.view addSubview:button];