在文本字段中居中对齐占位符 [英] Center align placeholder in textfield

问题描述

我知道这个问题曾多次被问过，但是我已经弃用了，我需要在ios 8中使用它。由于我有一个文本字段，我需要占位符在中心对齐并且测试的其余部分保持对齐。请帮助我。

I know this question been asked many times but as drawinrect deprecated and I need this in ios 8.As I have a textfield and I need the placeholder in center align and rest of the test left align.Please help me out.

推荐答案

创建IBOutlet并将其连接到textField。在 YourViewController.m

Create and connect IBOutlet to your textField. In YourViewController.m

@interface YourViewController () <UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UITextField *txt;

在 viewDidLoad

self.txt.delegate=self;
self.txt.textAlignment=NSTextAlignmentCenter;

编写此委托方法..每当文本字段中的文本发生变化时，此方法都会调用。

Write this delegate method..this method calls everytime when text in text field changes.

- (BOOL) textField: (UITextField *)theTextField shouldChangeCharactersInRange: (NSRange)range replacementString: (NSString *)string {

    NSRange textFieldRange = NSMakeRange(0, [self.txt.text length]);
    // Check If textField is empty. If empty align your text field to center, so that placeholder text will show center aligned
    if (NSEqualRanges(range, textFieldRange) && [string length] == 0) {
    self.txt.textAlignment=NSTextAlignmentCenter;
    }
    else //else align textfield to left. 
    {
        self.txt.textAlignment=NSTextAlignmentLeft;
    }
    return YES;
}

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