将UITextField增加到某个长度

本文介绍了将UITextField增加到某个长度的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个UITextField，我想自动调整其边界大小，以便为字段中添加的字符串空间。但是，我想在一定量的宽度上达到最大。

I have a UITextField that I would like to "automatically" adjust its bounds size in order to make space for the string added in the field. However, I would like it to max-out in terms of width at a certain amount. What is the best way that I can go about doing this?

感谢您的帮助。

EDIT：

TestingView.h

TestingView.h

#import <UIKit/UIKit.h> @interface TestingView : UIView <UITextFieldDelegate> { } @end

< .m

TestingView.m

#import "TestingView.h" @implementation TestingView - (void)awakeFromNib { CGRect testingBounds = self.bounds; testingBounds.size.width = testingBounds.size.width - 20; testingBounds.size.height = 30; CGPoint testingCenter = self.center; testingCenter.y = testingCenter.y - 75; UITextField *testingField = [[UITextField alloc] initWithFrame:testingBounds]; testingField.center = testingCenter; testingField.delegate = self; testingField.placeholder = @"Testing"; [self addSubview:testingField]; } - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { int yourMaxWidth = 150; float width = [textField.text sizeWithFont: [UIFont systemFontOfSize: 14] constrainedToSize: CGSizeMake(yourMaxWidth, textField.bounds.size.height)].width; textField.bounds = CGRectMake(textField.bounds.origin.x, textField.bounds.origin.y, width, textField.bounds.size.height); return YES; } @end

推荐答案

在委托方法 textField：shouldChangeCharactersInRange：replacementString：你应该使用 UITextField developer.apple/iphone/library/documentation/UIKit/Reference/NSString_UIKit_Additions/Reference/Reference.html#//apple_ref/occ/instm/NSString/sizeWithFont:constrainedToSize：rel =nofollow noreferrer> sizeWithFont：constrainedToSize：，并使用返回的 CGSize 的width参数设置您的 UITextField

In the delegate method textField:shouldChangeCharactersInRange:replacementString: you should measure your UITextField's text size by using sizeWithFont:constrainedToSize: and use the returning CGSize's width parameter to set your UITextField's bounds width.

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { float width = [yourTextField.text sizeWithFont: [UIFont systemFontOfSize: 14] constrainedToSize: CGSizeMake(yourMaxWidth, yourTextField.bounds.size.height)].width; yourTextField.bounds = CGRectMake(yourTextField.bounds.origin.x, yourTextField.bounds.origin.y, width, yourTextField.bounds.size.height); }