Question

在我的项目中，我使用的是UITextField，它嵌入带有圆角的纯白色UIButton中，以创建“漂亮”的文本字段。此代码在不同视图中多次使用，因此我决定为此目的创建自定义UIView。这个自定义UIView的代码：

BSCustomTextField.h

#import <Foundation/Foundation.h>

@interface BSCustomTextField : UIView {
  UIButton* btnTextFieldContainer;
  UITextField* textField;
  NSString* text;
}

@property (retain, nonatomic) UIButton* btnTextFieldContainer;
@property (retain, nonatomic) UITextField* textField;
@property (retain, nonatomic) NSString* text;

-(id)initWithPosition:(CGPoint)position;
@end

BSCustomTextField.m

#import "BSCustomTextField.h"
#import <QuartzCore/QuartzCore.h>

@implementation BSCustomTextField
@synthesize btnTextFieldContainer, textField, text;

-(id)initWithPosition:(CGPoint)position{
   if (self == [super init]) {
      btnTextFieldContainer = [[UIButton alloc] initWithFrame:CGRectMake(position.x, position.y, 260, 50)];
      btnTextFieldContainer.backgroundColor = [UIColor whiteColor];
      [[btnTextFieldContainer layer] setCornerRadius:3.];
      [[btnTextFieldContainer layer] setMasksToBounds:YES];
      [[btnTextFieldContainer layer] setBorderWidth:0.];

      textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 240, 30)];

      textField.backgroundColor = [UIColor whiteColor];
      textField.clearButtonMode = UITextFieldViewModeAlways;
      textField.returnKeyType   = UIReturnKeySend;
      textField.keyboardType    = UIKeyboardTypeEmailAddress;
      textField.font               = [UIFont fontWithName:@"Helvetica-Bold" size:20.];

      [btnTextFieldContainer addSubview:textField];
      [self addSubview:btnTextFieldContainer];
   }
   return self;
}

-(void)dealloc{
   [btnTextFieldContainer release];
   [textField release];
   [super dealloc];
}
@end

因此，在容器视图的 viewDidLoad 中使用此视图时（请参阅下面的代码），视图将在所需位置正确呈现，并且看起来与指定完全相同，但它对触摸事件没有反应因此，触摸时不会成为第一响应者。

代码：

searchTextField = [[BSCustomTextField alloc] initWithPosition:CGPointMake(30, 150)];
searchTextField.textField.placeholder       = NSLocalizedString(@"lsUserName", @"");
[[(BSPlainHeaderWithBackButtonView*)self.view contentView] addSubview:searchTextField];

以编程方式调用 [searchTextField.textField becomeFirstResponder] 并使键盘显示。

但是，有趣的是，如果我将 BSCustomTextField 的代码嵌入我的容器中，就像这样：

UIButton* btnTextFieldContainer = [[UIButton alloc] initWithFrame:CGRectMake(30, 150, 260, 50)];
btnTextFieldContainer.backgroundColor = [UIColor whiteColor];
[[btnTextFieldContainer layer] setCornerRadius:3.];
[[btnTextFieldContainer layer] setMasksToBounds:YES];
[[btnTextFieldContainer layer] setBorderWidth:0.];

searchTextField = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 240, 30)];

searchTextField.backgroundColor = [UIColor whiteColor];
searchTextField.clearButtonMode = UITextFieldViewModeAlways;
searchTextField.returnKeyType   = UIReturnKeySend;
searchTextField.keyboardType    = UIKeyboardTypeEmailAddress;
searchTextField.font            = [UIFont fontWithName:@"Helvetica-Bold" size:20.];
searchTextField.placeholder     = NSLocalizedString(@"lsUserName", @"");

[btnTextFieldContainer addSubview:searchTextField];
[[(BSPlainHeaderWithBackButtonView*)self.view contentView] addSubview:btnTextFieldContainer];
[btnTextFieldContainer release];

一切都按预期工作，文本字段对触摸作出反应。 searchTextField的类型在每个案例的头文件中正确设置。唯一的区别是，在第一种情况下，我在UIButton和UITextFiled上有一个额外的包装UIView。我不知道如何使文本字段成为触摸的第一响应者。

提前多多感谢，罗马

Answer 1

好的，我有解决方案。 raaz对UIResponder课程的观点让我觉得在响应者链中肯定存在错误，因此我做了一些研究并找到了这个主题：Allowing interaction with a UIView under another UIView其中讨论了相同的问题。 /> 这是BSCustomTextField.m的新工作代码

#import "BSCustomTextField.h"
#import <QuartzCore/QuartzCore.h>


@implementation BSCustomTextField
@synthesize btnTextFieldContainer, textField, text;

-(id)initWithPosition:(CGPoint)position{
  if (self == [super init]) {
    btnTextFieldContainer = [[UIButton alloc] initWithFrame:CGRectMake(position.x, position.y, 260, 50)];
    btnTextFieldContainer.backgroundColor = [UIColor whiteColor];
    [[btnTextFieldContainer layer] setCornerRadius:3.];
    [[btnTextFieldContainer layer] setMasksToBounds:YES];
    [[btnTextFieldContainer layer] setBorderWidth:0.];

    textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 240, 30)];

    textField.backgroundColor = [UIColor whiteColor];
    textField.clearButtonMode = UITextFieldViewModeAlways;
    textField.returnKeyType   = UIReturnKeySend;
    textField.keyboardType    = UIKeyboardTypeEmailAddress;
    textField.font             = [UIFont fontWithName:@"Helvetica-Bold" size:20.];

    [btnTextFieldContainer addSubview:textField];
    [self addSubview:btnTextFieldContainer];
  }
  return self;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    // UIView will be "transparent" for touch events if we return NO
    return YES;
}

-(void)dealloc{
  [btnTextFieldContainer release];
  [textField release];
  [super dealloc];
}
@end

由于可点击区域填写了整个BSCustomTextField视图，我们只需在pointInside中返回YES：withEvent：

谢谢大家指出我正确的方向。

Answer 2

参考UIResponder class

此类具有实例方法becomeFirstResponder:＆amp; isFirstResponder:

另外，不要忘记将textfield editing属性设置为YES

Answer 3

哦，你这样做是完全错的。您应该将可伸缩图像添加到UIImageView中并将其放在UITextField下面。

UIImage *backgroundImage = [[UIImage imageNamed:@"fieldBackground.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];

或者您可以尝试在UIButton中禁用userInteraction。

嵌入在UIView中的UITextField不响应触摸事件

3 个答案: