最好的方法是使用UITextField的子类并在.m文件中创建一个类

 #import "CustomTextField.h"
 #import <QuartzCore/QuartzCore.h>
 @implementation CustomTextField


- (id)initWithCoder:(NSCoder*)coder 
 {
  self = [super initWithCoder:coder];

  if (self) {

//self.clipsToBounds = YES;
//[self setRightViewMode:UITextFieldViewModeUnlessEditing];

self.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,15,46)];
self.leftViewMode=UITextFieldViewModeAlways;
   }

  return self;

 }

通过这样做，去到你的故事板或xib，点击身份检查器，用你自己的“CustomTextField”在类选项替换UITextfield。

注意:如果你只是给文本框自动布局填充，那么你的应用程序将不会运行，只显示空白屏幕。

以下是如何在SWIFT中实现这一点

@IBOutlet weak var yourTextField: UITextField!

override func viewDidLoad() {
super.viewDidLoad()
let paddingView = UIView(frame: CGRectMake(0, 0, 10, self.yourTextField.frame.height))
yourTextField.leftView = paddingView
yourTextField.leftViewMode = UITextFieldViewMode.Always
}
}

资源

为UITextField添加填充的一个好方法是子类化并添加一个edgeInsets属性。然后设置edgeInsets和UITextField将相应地绘制。对于自定义的leftView或rightView集，这也能正确地发挥作用。

OSTextField.h

#import <UIKit/UIKit.h>

@interface OSTextField : UITextField

@property (nonatomic, assign) UIEdgeInsets edgeInsets;

@end

OSTextField.m

#import "OSTextField.h"

@implementation OSTextField

- (id)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        self.edgeInsets = UIEdgeInsetsZero;
    }
    return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder{
    self = [super initWithCoder:aDecoder];
    if(self){
        self.edgeInsets = UIEdgeInsetsZero;
    }
    return self;
}

- (CGRect)textRectForBounds:(CGRect)bounds {
    return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}

- (CGRect)editingRectForBounds:(CGRect)bounds {
    return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}

@end

一个Swift 3版本的Xcode >6，在那里你可以在接口生成器/故事板编辑插入值。

import UIKit

@IBDesignable
class FormTextField: UITextField {

    @IBInspectable var inset: CGFloat = 0

    override func textRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: inset, dy: inset)
    }

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

}

基于Evil Trout的回答，你可能想要创建一个类别，使它更容易在多个应用程序中使用。

头文件:

@interface UITextField (PaddingText)

-(void) setLeftPadding:(int) paddingValue;

-(void) setRightPadding:(int) paddingValue;
@end

实现文件:

#import "UITextField+PaddingText.h"

@implementation UITextField (PaddingText)

-(void) setLeftPadding:(int) paddingValue
{
    UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, paddingValue, self.frame.size.height)];
    self.leftView = paddingView;
    self.leftViewMode = UITextFieldViewModeAlways;
}

-(void) setRightPadding:(int) paddingValue
{
    UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, paddingValue, self.frame.size.height)];
    self.rightView = paddingView;
    self.rightViewMode = UITextFieldViewModeAlways;
}

@end

使用的例子

#import "UITextField+PaddingText.h"

[self.YourTextField setLeftPadding:20.0f];

希望这对你们有所帮助

干杯

最好的方法是使用UITextField的子类并在.m文件中创建一个类

 #import "CustomTextField.h"
 #import <QuartzCore/QuartzCore.h>
 @implementation CustomTextField


- (id)initWithCoder:(NSCoder*)coder 
 {
  self = [super initWithCoder:coder];

  if (self) {

//self.clipsToBounds = YES;
//[self setRightViewMode:UITextFieldViewModeUnlessEditing];

self.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,15,46)];
self.leftViewMode=UITextFieldViewModeAlways;
   }

  return self;

 }

通过这样做，去到你的故事板或xib，点击身份检查器，用你自己的“CustomTextField”在类选项替换UITextfield。

注意:如果你只是给文本框自动布局填充，那么你的应用程序将不会运行，只显示空白屏幕。