iOS UITextField中禁止复制粘贴
UITextField中有一个方法:
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender
能够控制用户对输入框进行哪种操作:
cut: // 剪切
copy: // 拷贝
select: // 选择
selectAll: // 全选
paste: // 粘贴
delete: // 删除
_promptForReplace: // Replace...
_transliterateChinese: // 简<=>繁
_showTextStyleOptions: // B/<u>U</u>
_define: // Define
_addShortcut: // Learn...
_accessibilitySpeak: // Speak
_accessibilitySpeakLanguageSelection: // Speak...
_accessibilityPauseSpeaking: // Pause
_share: // 共享...
makeTextWritingDirectionRightToLeft: // 往右缩进
makeTextWritingDirectionLeftToRight: // 往左缩进
可以看出有很多操作都是默认开放的。如果需要禁用默写操作建议整体禁用,或者你需要用到哪些操作,就针对这些操作开放,其他的都禁止了。
代码如下:
//建议整体禁用(复制、粘贴、全选等都被禁用了)
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
UIMenuController *menuController = [UIMenuController sharedMenuController];
if (menuController) {
[UIMenuController sharedMenuController].menuVisible = NO;
}
return NO;
}
//选择我们需要的权限打开 - 这样可以有效的控制不必要的权限使用
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
//此处我们选择打开粘贴功能、其他功能都禁用
if (action == @selector(paste:))
return YES;
return NO;
}
注意:需要写UITextField的分类重写canPerformAction方法,再针对输入框需要的操作打开对应的权限。
demo代码如下:
#import "UITextField+SET.h"
@implementation UITextField (SET)
//选择我们需要的权限打开 - 这样可以有效的控制不必要的权限使用
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (self.tag == 100) {
//此处我们选择打开粘贴功能、其他功能都禁用
if (action == @selector(paste:))
return YES;
}else if (self.tag == 101){
//此处我们选择打开选择、全选、复制功能、其他功能都禁用
if (action == @selector(copy:) || action == @selector(select:) || action == @selector(selectAll:))
return YES;
}
return NO;
}
@end
#import "ViewController.h"
@interface ViewController ()<UITextFieldDelegate>
@property (nonatomic, strong) UITextField *pasteField;
@property (nonatomic, strong) UITextField *noneField;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.pasteField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, 200, 30)];
self.pasteField.layer.borderWidth = 0.5f;
self.pasteField.layer.borderColor = [UIColor blackColor].CGColor;
self.pasteField.placeholder = @"只允许粘贴";
self.pasteField.delegate = self;
self.pasteField.tag = 100;
[self.view addSubview:self.pasteField];
self.noneField = [[UITextField alloc] initWithFrame:CGRectMake(20, 200, 200, 30)];
self.noneField.layer.borderWidth = 0.5f;
self.noneField.layer.borderColor = [UIColor blackColor].CGColor;
self.noneField.placeholder = @"只允许选择、全选、复制";
self.noneField.delegate = self;
self.noneField.tag = 101;
[self.view addSubview:self.noneField];
}
@end
demo git地址:https://github.com/ITHanYong/UITextField-banCopyPaste.git