iOS 8中具有动态高度的自定义inputView

概述我的自定义inputView for UITextFields有些麻烦.根据用户需要在UITextField中输入的文本,inputView仅显示所需的字母.这意味着对于短文本,只有一行字母的inputView就足够了,较长的文本可能需要2行甚至3行,因此inputView的高度是变量. 由于我期望性能更好,因此每个textField只使用一个inputView实例.这样创建必须只发生一次,这使得 我的自定义inputVIEw for UITextFIElds有些麻烦.根据用户需要在UITextFIEld中输入的文本,inputVIEw仅显示所需的字母.这意味着对于短文本,只有一行字母的inputVIEw就足够了,较长的文本可能需要2行甚至3行,因此inputVIEw的高度是变量.

由于我期望性能更好,因此每个textFIEld只使用一个inputVIEw实例.这样创建必须只发生一次,这使得有时需要直接访问inputVIEw更容易. inputVIEw设置在 – (BOol)textFIEldShouldBeginEditing：(UITextFIEld *)textFIEld中,设置其所需的高度并将显示.

这非常有效,但不适用于iOS8.有一些包含inputVIEw的系统视图在更改时不会更新其框架以匹配inputVIEw的边界(第一次工作).

我知道可以通过每个textFIEld使用我的inputVIEw的一个实例来修复.但我问是否有一种推荐/更好的方法来调整框架或将其更改报告给包含视图.也许这是一个iOS8错误,可以修复直到发布？

以下是重现问题的示例代码：

CustominputVIEw

@implementation CustominputVIEw+ (CustominputVIEw*)sharedinputVIEw{    static CustominputVIEw *sharedInstance;    static dispatch_once_t oncetoken;    dispatch_once(&oncetoken,^{        sharedInstance = [[CustominputVIEw alloc] init];    });    return sharedInstance;}- (ID)init{    self = [super init];    if (self) {        self.backgroundcolor = [UIcolor greencolor];    }    return self;}- (voID)setupForTextFIEld:(UITextFIEld*)textFIEld{    CGfloat height;    if(textFIEld.tag == 1){        height = 100;    }else height = 50;    self.frame = CGRectMake(0,320,height);}@end

TestVIEwController代码

- (voID)vIEwDIDLoad{    [super vIEwDIDLoad];    UITextFIEld *tf = [[UITextFIEld alloc] initWithFrame:CGRectMake(15,50,290,30)];    tf.text = @"bigKeyboard";    tf.inputVIEw = [CustominputVIEw sharedinputVIEw];    tf.layer.borderWIDth = 1;    tf.layer.bordercolor = [UIcolor lightGraycolor].CGcolor;    tf.delegate = self;    tf.tag = 1;    [self.vIEw addSubvIEw:tf];    tf = [[UITextFIEld alloc] initWithFrame:CGRectMake(15,100,30)];    tf.text = @"smallKeyboard";    tf.inputVIEw = [CustominputVIEw sharedinputVIEw];    tf.layer.borderWIDth = 1;    tf.layer.bordercolor = [UIcolor lightGraycolor].CGcolor;    tf.delegate = self;    tf.tag = 2;    [self.vIEw addSubvIEw:tf];    UIbutton *button = [UIbutton buttonWithType:UIbuttonTypeSystem];    [button setTitle:@"dismissKeyboard" forState:UIControlStatenormal];    [button addTarget:self action:@selector(endEditing) forControlEvents:UIControlEventtouchUpInsIDe];    button.frame = CGRectMake(15,150,30);    [self.vIEw addSubvIEw:button];}- (voID)endEditing{    [self.vIEw endEditing:YES];}- (BOol)textFIEldShouldBeginEditing:(UITextFIEld *)textFIEld{    [[CustominputVIEw sharedinputVIEw] setupForTextFIEld:textFIEld];    return YES;}

解决方法 我在将自定义键盘从iOS 8调整到iOS 10时遇到了类似的问题.我认为正确的解决方案是让输入视图提供适当的intrinsicContentSize并在您想要更改视图高度时更改(并使其无效！)该值.示例代码：

class CustominputVIEw: UIinputVIEw {    var intrinsicHeight: CGfloat = 200 {        dIDSet {            self.invalIDateIntrinsicContentSize()        }    }    init() {        super.init(frame: CGRect(),inputVIEwStyle: .keyboard)        self.translatesautoresizingMaskIntoConstraints = false    }    required init?(coder: NSCoder) {        super.init(coder: coder)        self.translatesautoresizingMaskIntoConstraints = false    }    overrIDe var intrinsicContentSize: CGSize {        return CGSize(wIDth: UIVIEwNoIntrinsicmetric,height: self.intrinsicHeight)    }}class VIEwController: UIVIEwController {    @IBOutlet weak var textVIEw: UITextVIEw!    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        textVIEw.becomeFirstResponder()        let inputVIEw = CustominputVIEw()        // To make the vIEw's size more clear.        inputVIEw.backgroundcolor = UIcolor(red: 0.5,green: 1,blue: 0.5,Alpha: 1)        textVIEw.inputVIEw = inputVIEw        // To demonstrate a change to the vIEw's intrinsic height.        dispatchQueue.main.asyncAfter(deadline: dispatchTime.Now() + .seconds(2)) {            inputVIEw.intrinsicHeight = 400        }    }}

另见https://stackoverflow.com/a/40359382/153354.

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