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我找实现输入掩码的方法来的UITextField像这样:实现输入掩码来的UITextField
主要特点:
- 显示占位符,空字符至光标右侧
- 禁止对于当前光标位置不正确字符的输入(例如,第一个字符只能是拉丁字符,第二字符只能是一个数字)
- 禁止选择,剪切并粘贴
- 禁止设置光标位置(用户将只能添加一个新的字符或删除最后一个)
我找实现输入掩码的方法来的UITextField像这样:实现输入掩码来的UITextField
主要特点:
我能得到这一切与一个子类的UITextField工作。您可能想要将这些委托方法移动到ViewController中,并在那里设置自定义的TextField委托。为了这个例子,更容易在一个班级中向你展示一切。显然,你将不得不调整允许满足你需求的字符集。
#import "TextField.h"
@interface TextField()<UITextFieldDelegate>
@end
@implementation TextField
-(instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.delegate = self;
}
return self;
}
- (UITextPosition *)closestPositionToPoint:(CGPoint)point{
UITextPosition *beginning = self.beginningOfDocument;
UITextPosition *end = [self positionFromPosition:beginning offset:self.text.length];
return end;
}
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (action == @selector(paste:)
|| action == @selector(select:)
|| action == @selector(selectAll:)
|| action == @selector(cut:)){
return NO;
}
return [super canPerformAction:action withSender:sender];
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if (range.location == 0 && [string rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet]].location == NSNotFound) {
return NO;
}else if (range.location == 1 && [string rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]].location == NSNotFound){
return NO;
}
return YES;
}
@end
,可能是情侣贵点有用的:HTTP://stackoverflow.com/questions/2388448/re-apply-currency-formatting-to-a-uitextfield-on-a-change-event/ 2919532#2919532 – casillas