[英]Detect delete key using UIKeyCommand
任何人都知道如何在iOS 7上使用UIKeyCommand
检测“删除”键?
As people were having problems with Swift, I figured a small, complete example in both Objective C and Swift might be a good answer. 由于人们遇到了Swift的问题,我在Objective C和Swift中找到了一个小而完整的例子可能是一个很好的答案。
Note that Swift doesn't have a \\b
escape character for backspace, so you need to use a simple Unicode scalar value escape sequence of \\u{8}\u003c/code> .
请注意,Swift没有用于退格的
\\b
转义字符,因此您需要使用\\u{8}\u003c/code>的简单Unicode标量值转义序列。
This maps to the same old-school ASCII control character number 8 ("control-H", or ^H in caret notation ) for backspace as
\\b
does in Objective C. 对于退格键,这将映射到相同的旧学校ASCII控制字符编号8(“control-H”或插入符号中的 ^ H),如目标C中的
\\b
。
Here's an Objective C view controller implementation that catches backspaces:
这是一个捕获退格的Objective C视图控制器实现:
#import "ViewController.h"
@implementation ViewController
// The View Controller must be able to become a first responder to register
// key presses.
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (NSArray *)keyCommands {
return @[
[UIKeyCommand keyCommandWithInput:@"\b" modifierFlags:0 action:@selector(backspacePressed)]
];
}
- (void)backspacePressed {
NSLog(@"Backspace key was pressed");
}
@end
And here's the equivalent view controller in Swift:
这是Swift中的等效视图控制器:
import UIKit
class ViewController: UIViewController {
override var canBecomeFirstResponder: Bool {
return true;
}
override var keyCommands: [UIKeyCommand]? {
return [
UIKeyCommand(input: "\u{8}", modifierFlags: [], action: #selector(backspacePressed))
]
}
@objc func backspacePressed() {
NSLog("Backspace key was pressed")
}
}
很简单 - 需要查找退格字符“\\ b”
You can always try UIKeyInput. 您可以随时尝试UIKeyInput。 https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIKeyInput_Protocol/index.html#//apple_ref/occ/intfm/UIKeyInput/deleteBackward
https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIKeyInput_Protocol/index.html#//apple_ref/occ/intfm/UIKeyInput/deleteBackward
The function should be 功能应该是
- (void)deleteBackward - (void)deleteBackward
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