[英]Assigning a callback to a UIView's UIButton from the containing UIViewController
[英]Assigning UIButton to UIView in Xcode
在我的项目中,我出于以下目的使用了以下代码,并且该代码正常工作。 我的代码:
UIView *view = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",index]]] autorelease];
view.frame = CGRectMake(70, 80, 180, 260);
return view;
但是在这里我想使用UIButton而不是UIImageView,所以我用以下代码替换了上面代码的第一行:
UIView *view=[[UIButton alloc] setBackgroundImage:(UIImage *)[scrollImages objectAtIndex:index] forState:UIControlStateNormal];
但是在这一点上我收到一条错误消息
“使用不兼容类型'void'的表达式初始化'UIView * _strong'”。
任何人都可以通过将UIImageView替换为UIButton来帮助我解决此问题。
通过“ alloc”创建UIButton
实例后,应将其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),这肯定是与UIView不兼容的类型。
像这样...
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];
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