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

只是UITextField的子类，像这样:

@implementation DFTextField


- (CGRect)textRectForBounds:(CGRect)bounds
{
    return CGRectInset(bounds, 10.0f, 0);
}

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


@end

这增加了10点的水平填充两边。

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。

Swift 3解决方案

class CustomTextField: UITextField {

 override func textRect(forBounds bounds: CGRect) -> CGRect {
  return CGRect(x: bounds.origin.x + 10, y: bounds.origin.y + 8, width: bounds.size.width - 20, height: bounds.size.height - 16)
 }

 override func editingRect(forBounds bounds: CGRect) -> CGRect {
  return self.textRect(forBounds: 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

用UITextBorderStyleNone: Swift设置UITextField的填充

基于@Evil Trout投票最多的答案，我在我的ViewController类中创建了一个自定义方法，如下所示:

- (void) modifyTextField:(UITextField *)textField
{
    UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)];
    textField.leftView = paddingView;
    textField.leftViewMode = UITextFieldViewModeAlways;
    textField.rightView = paddingView;
    textField.rightViewMode = UITextFieldViewModeAlways;

    [textField setBackgroundColor:[UIColor whiteColor]];
    [textField setTextColor:[UIColor blackColor]];
}

现在我可以调用该方法内部(viewDidLoad方法)，并发送我的任何TextFields到该方法，并为左右添加填充，并通过只写一行代码给出文本和背景颜色，如下所示:

[self modifyTextField:self.firstNameTxtFld];

这在iOS 7上非常完美! 我知道添加太多的视图可能会使这个类的加载变得更重一些。但当考虑到其他解决方法的难度时，我发现自己更偏向于这种方法，使用这种方法也更灵活。；）

感谢黑客“邪恶鳟鱼”!(鞠躬)

我认为我应该用Swift更新这个答案的代码片段:

既然Swift允许我们为现有的类写扩展，我们就这样写吧。

extension UITextField {
    func addPaddingToTextField() {
        let paddingView: UIView = UIView.init(frame: CGRectMake(0, 0, 8, 20))
        self.leftView = paddingView;
        self.leftViewMode = .Always;
        self.rightView = paddingView;
        self.rightViewMode = .Always;

    
        self.backgroundColor = UIColor.whiteColor()
        self.textColor = UIColor.blackColor()
    }
}

用法:

self.firstNameTxtFld.addPaddingToTextField()

希望这对其他人有帮助! 干杯!