我以编程方式创建一个工具栏,并以编程方式在工具栏中添加四个UIBarButtonItem。当文本视图开始编辑时,如果在textview中没有文本,则清除按钮和转换按钮将被禁用。这是我的四个按钮创建代码。
UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
numberToolbar.backgroundColor = [UIColor lightGrayColor];
numberToolbar.items = [NSArray arrayWithObjects:
[[UIBarButtonItem alloc]initWithTitle:@"Hide" style:UIBarButtonItemStyleDone target:self action:@selector(cancelKeyboard)],
[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
[[UIBarButtonItem alloc]initWithTitle:@"Clear" style:UIBarButtonItemStyleDone target:self action:@selector(clearTextView)],
[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
[[UIBarButtonItem alloc]initWithTitle:@"Paste" style:UIBarButtonItemStyleDone target:self action:@selector(paste)],
[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
[[UIBarButtonItem alloc]initWithTitle:@"Translate" style:UIBarButtonItemStyleDone target:self action:@selector(translate)],
nil];
[numberToolbar sizeToFit];
_sorceTextview.inputAccessoryView = numberToolbar;
_sorceTextview.autocorrectionType = UITextAutocorrectionTypeNo;
现在我如何禁用清除和翻译按钮:
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView {}
方法?请帮助。
最佳答案
为这些按钮使用实例变量。然后,您可以根据需要设置enabled
属性。
@implementation MyViewController {
UIBarButtonItem *_btnClear;
UIBarButtonItem *_btnTranslate;
}
然后在您的工具栏设置代码中:
_btnClear = [[UIBarButtonItem alloc]initWithTitle:@"Clear" style:UIBarButtonItemStyleDone target:self action:@selector(clearTextView)];
_btnTranslate = [[UIBarButtonItem alloc]initWithTitle:@"Translate" style:UIBarButtonItemStyleDone target:self action:@selector(translate)];
UIBarButtonItem *flex = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
numberToolbar.items = @[
[[UIBarButtonItem alloc]initWithTitle:@"Hide" style:UIBarButtonItemStyleDone target:self action:@selector(cancelKeyboard)],
flex,
_btnClear,
flex,
[[UIBarButtonItem alloc]initWithTitle:@"Paste" style:UIBarButtonItemStyleDone target:self action:@selector(paste)],
flex,
_btnTranslate
];
然后,在需要禁用的地方可以执行以下操作:
_btnClear.enabled = NO;
并启用:
_btnClear.enabled = YES;