斯威夫特版本:

extension UITextField {
    @IBInspectable var padding_left: CGFloat {
        get {
            LF.log("WARNING no getter for UITextField.padding_left")
            return 0
        }
        set (f) {
            layer.sublayerTransform = CATransform3DMakeTranslation(f, 0, 0)
        }
    }
}

这样你就可以在IB中赋值

我是基于Nate的解决方案，但后来我发现，这导致问题，当你使用leftView/rightView属性，所以它更好地调优超级的实现，因为它将左/右视图的考虑。

- (CGRect)textRectForBounds:(CGRect)bounds {
    CGRect ret = [super textRectForBounds:bounds];
    ret.origin.x = ret.origin.x + 5;
    ret.size.width = ret.size.width - 10;
    return ret;
}

- (CGRect)editingRectForBounds:(CGRect)bounds {
    return [self textRectForBounds:bounds];
}

Objective C代码

MyTextField.h

#import <UIKit/UIKit.h>

@interface MyTextField : UITextField

@property (nonatomic) IBInspectable CGFloat padding;

@end

MyTextField.m

#import "MyTextField.h"

IB_DESIGNABLE
@implementation MyTextField

@synthesize padding;

-(CGRect)textRectForBounds:(CGRect)bounds{
    return CGRectInset(bounds, padding, padding);
}

-(CGRect)editingRectForBounds:(CGRect)bounds{
    return [self textRectForBounds:bounds];
}

@end

我发现了一个整洁的小hack来设置左侧填充的确切情况。

基本上，你设置UITextField的leftView属性为你想要的填充大小的空视图:

UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)];
textField.leftView = paddingView;
textField.leftViewMode = UITextFieldViewModeAlways;

对我来说简直就是魔法!

在Swift 3/ Swift 4中，可以通过这样做来实现

let paddingView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 5, height: 20))
textField.leftView = paddingView
textField.leftViewMode = .always

就像这样子类UITextField (Swift版本):

import UIKit

class CustomTextField: UITextField {

    override func textRectForBounds(bounds: CGRect) -> CGRect {
       return CGRectInset(bounds, 25.0, 0)
    }

    override func editingRectForBounds(bounds: CGRect) -> CGRect {
       return self.textRectForBounds(bounds)
    }

}

这增加了25.0点的水平填充两边。

斯威夫特版本:

extension UITextField {
    @IBInspectable var padding_left: CGFloat {
        get {
            LF.log("WARNING no getter for UITextField.padding_left")
            return 0
        }
        set (f) {
            layer.sublayerTransform = CATransform3DMakeTranslation(f, 0, 0)
        }
    }
}

这样你就可以在IB中赋值