效果图
图比较慢..稍等哈.gif
思路
车牌号码输入的部分都是UILabel,每个label显示一个文字。
弹出键盘通过重写UILabel的inputView来实现。
关于inputView
UITextField的两个属性
// Presented when object becomes first responder. If set to nil, reverts to following responder chain. If
// set while first responder, will not take effect until reloadInputViews is called.
@property (nullable, readwrite, strong) UIView *inputView;
@property (nullable, readwrite, strong) UIView *inputAccessoryView;
在UITextField成为默认响应的时候，会弹出系统键盘。如果对这两个控件的inputView属性设置了自定义的view，在其成为第一响应的时候系统键盘将不再弹出，取而代之的是赋值给inputView的那个view。inputAccessoryView是键盘的辅助视图，即键盘上面那部分。同样当对inputAccessoryView设置了自定义view时，键盘弹出的同时，该view会作为辅助视图出现在键盘的上面，和键盘一起弹出。
UILabel也有这两个属性
// Called and presented when object becomes first responder. Goes up the responder chain.
@property (nullable, nonatomic, readonly, strong) __kindof UIView *inputView NS_AVAILABLE_IOS(3_2);
@property (nullable, nonatomic, readonly, strong) __kindof UIView *inputAccessoryView NS_AVAILABLE_IOS(3_2);
可以看到inputView和inputAccessoryView是只读的。(这次只用到inputView,暂不讨论inputAccessoryView）
要做到点击弹出键盘的效果，就要自定义UILabel，然后重新申明inputView为readwrite的，并重写get方法，这样在UILabel成为第一响应的时候会自动弹出inputView。
部分代码
@interface SingleEnterLabel : UILabel
@property (strong, nonatomic,readwrite) UIView *inputView;
@end
//重写get方法
- (UIView *)inputView{
if (!_inputView) {
_inputView = [self creatInputViewWithType:self.inputViewType];
}
return _inputView;
}
- (BOOL)canBecomeFirstResponder{
return YES;
}
使用
SingleEnterLabel *textLabel = [[SingleEnterLabel alloc]initWithFrame:frame];
UITapGestureRecognizer *tapLabel = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapLabelClick:)];
textLabel.userInteractionEnabled = YES;
tapLabel.numberOfTapsRequired = 1;
tapLabel.delaysTouchesBegan = YES;
[textLabel addGestureRecognizer:tapLabel];
- (void)tapLabelClick:(UITapGestureRecognizer *)tap{
UIView *view = tap.view;
[view becomeFirstResponder];
}
完整代码下载：LicensePlateNoEnterView