iOS--inputView和inputAccessoryView

iOS–inputView和inputAccessoryView

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什么是inputView和inputAccessoryView？

如果是UITextField和UITextView，下面是声明文件源代码：

// set while first responder, will not take effect until reloadInputViews is called.
@property (readwrite, retain) UIView *inputView;
@property (readwrite, retain) UIView *inputAccessoryView;

如果是其他的控件，继承了UIResponder，（UIView 是UIResponder的子类），下面是声明文件源代码：

// Called and presented when object becomes first responder.  Goes up the responder chain.
@property (nonatomic, readonly, retain) UIView *inputView NS_AVAILABLE_IOS(3_2);
@property (nonatomic, readonly, retain) UIView *inputAccessoryView NS_AVAILABLE_IOS(3_2);

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自定义TextField或TextView

自定义只需要重写下面的两个属性

textField.inputView = [UIView alloc] init];
textField.inputAccessoryView = [UIToolbar alloc] init];

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自定义继承了UIResponder类的控件

需要自定义UIResponder的子类，我们需要在重新定义一个子类，然后再这个子类中声明inputView，inputAccessoryView为可读可写属性。然后重写getter方法。同时还需要覆盖-(BOOL)canBecomeFirstResponder方法。

下面以UIButton为例子的子类重设代码：

#import <UIKit/UIKit.h>

@interface ABEButton : UIButton

@property (nonatomic, strong)UIToolbar *inputAccessoryView;
@property (nonatomic, strong)UIView *inputView;

@end

#import "ABEButton.h"

#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width

@implementation ABEButton

-(BOOL)canBecomeFirstResponder
{
    return YES;
}

#pragma mark- Getter, Setter
- (UIView*)inputView{
    if (!_inputView) {
        _inputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 220)];
        _inputView.backgroundColor = [UIColor redColor];
    }
    return _inputView;
}

- (UIToolbar*)inputAccessoryView{
    if (!_inputAccessoryView) {
        _inputAccessoryView = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 40)];
        _inputAccessoryView.backgroundColor = [UIColor grayColor];
        UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@"隐藏" style:UIBarButtonItemStylePlain target:self action:@selector(clickFinishButton:)];
        _inputAccessoryView.items = @[item];
    }
    return _inputAccessoryView;
}

#pragma mark- Private method
- (void)clickFinishButton:(ABEButton*)buttonItem{
    [self resignFirstResponder];
}
@end

这样，我们就可以使用点击button，弹出inputView了。

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注意：不要忘记为button添加becomeFirstResponder。