将UITextField增加到某个长度 [英] Increase UITextField to Certain Length

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 http://developer.apple.com/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);
}

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