向 UITextField 添加左边距 [英] Add lefthand margin to UITextField

问题描述

我想将 UITextField 文本的左边距放在 10 像素处.最好的方法是什么?

I want to put the left margin of a UITextField's text at 10 px. What is the best way to do that?

推荐答案

正如我在之前的评论中所解释的，在这种情况下最好的解决方案是扩展 UITextField 类而不是使用类别，因此您可以在所需的文本字段上明确使用它.

As I have explained in a previous comment, the best solution in this case is to extend the UITextField class instead of using a category, so you can use it explicitly on the desired text fields.

#import <UIKit/UIKit.h>

@interface MYTextField : UITextField

@end


@implementation MYTextField

- (CGRect)textRectForBounds:(CGRect)bounds {
    int margin = 10;
    CGRect inset = CGRectMake(bounds.origin.x + margin, bounds.origin.y, bounds.size.width - margin, bounds.size.height);
    return inset;
}

- (CGRect)editingRectForBounds:(CGRect)bounds {
    int margin = 10;
    CGRect inset = CGRectMake(bounds.origin.x + margin, bounds.origin.y, bounds.size.width - margin, bounds.size.height);
    return inset;
}

@end

类别旨在向现有类添加新函数，而不是覆盖现有方法.

A category is intended to add new functions to an existing class, not to override an existing method.

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