如何将UIImageView设置为标题，这样内容就不会被拉伸

Question

如果我执行以下操作，则titleView将被拉伸：

UIImage * img =[UIImage imageNamed:@"isikota_small.png"];
UIImageView * uiImage= [[UIImageView alloc]initWithImage:img];
self.navigationItem.titleView = uiImage;
PO(self.navigationItem.titleView);

如果我做

UIImage * img =[UIImage imageNamed:@"isikota_small.png"];
UIImageView * uiImage= [[UIImageView alloc]initWithImage:img];
uiImage.frame = CGRectMake(0,0,66,33);
uiImage.autoresizingMask = UIViewAutoresizingFlexibleHeight;
//[self.navigationItem.titleView addAndResizeSubView:uiImage]; doesn't work

self.navigationItem.titleView = uiImage;
PO(self.navigationItem.titleView);

标题视图也将被拉伸。

如果我这样做：

UIImage * img =[UIImage imageNamed:@"isikota_small.png"];
UIImageView * uiImage= [[UIImageView alloc]initWithImage:img];
uiImage.frame = CGRectMake(0,0,66,33);
uiImage.autoresizingMask = UIViewAutoresizingFlexibleHeight;
//[self.navigationItem.titleView addAndResizeSubView:uiImage]; doesn't work
UIView * uiv = [[UIView alloc]init];
[uiv addSubview:uiImage];
uiv.frame = CGRectMake(127, 0, 66, 33);
uiv.autoresizingMask=UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
self.navigationItem.titleView = uiv;
PO(self.navigationItem.titleView);

不知怎么的，苹果把uiv.frame改成了CGRectMake(127, 6, 66, 33)。

必须有一个优雅的解决方案。

Answer 1

当您将自定义视图用作titleView，以及tableViews和其他类似用例中的页脚和页眉时，iOS将忽略视图框架的偏移部分，或以某种不易预测的方式更改它。为了解决这个问题，你需要创建一个容器视图，这样你的容器就有偏移量（0,0）：

试试这样的东西：

UIImage * img =[UIImage imageNamed:@"isikota_small.png"];
UIImageView * uiImage= [[UIImageView alloc]initWithImage:img];
uiImage.frame = CGRectMake(127,0,66,33);
UIView * uiv = [[UIView alloc]init];
[uiv addSubview:uiImage];
uiv.frame = CGRectMake(0, 0, 66+127, 33);
self.navigationItem.titleView = uiv;

我不确定自动呼吸口罩是否也会把它扔掉，所以试着不戴口罩，看看你是否能得到你想要的行为。