iOS键盘回收-按return键盘回收-或者跳入下一个UITextFielf

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic, retain) UITextField *field1;
@property (nonatomic, retain) UITextField *field2;
@end

@implementation ViewController

• (void)dealloc
  {
  [_field1 release];
  [_field2 release];
  [super dealloc];
  }

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  self.view.backgroundColor = [UIColor whiteColor];
  UILabel *label1 = [[UILabel alloc]init];
  label1.frame = CGRectMake(50, 100, 60, 40);
  label1.backgroundColor = [UIColor cyanColor];
  label1.text = @"用户名:";
  [self.view addSubview:label1];

  UILabel *label2 = [[UILabel alloc]init];
  label2.frame = CGRectMake(label1.frame.origin.x, label1.frame.origin.y + label1.frame.size.height + 20, label1.frame.size.width, label1.frame.size.height);
  label2.text = @"密码:";
  label2.backgroundColor = [UIColor cyanColor];
  [self.view addSubview:label2];

self.field1 = [[UITextField alloc]init];

self.field1.frame = CGRectMake(label1.frame.origin.x + label1.frame.size.width + 30, label1.frame.origin.y, 200, label1.frame.size.height);
self.field1.backgroundColor = [UIColor cyanColor];
self.field1.placeholder = @"请输入Emial/手机/用户名";
// 键盘回收
self.field1.delegate = self;
[self.view addSubview:self.field1];

self.field2 = [[UITextField alloc] init];
self.field2.frame = CGRectMake(self.field1.frame.origin.x, self.field1.frame.origin.y + self.field1.frame.size.height + 20,self.field1.frame.size.width, self.field1.frame.size.height);
self.field2.backgroundColor = [UIColor cyanColor];
self.field2.placeholder = @"请输入密码";
self.field2.secureTextEntry = YES;
// 键盘回收  YIem博客
self.field2.delegate = self;
[self.view addSubview:self.field2];

}
// 键盘回收

• (BOOL)textFieldShouldReturn:(UITextField *)textField
  {
  if (textField == self.field1) {

    [self.field2 becomeFirstResponder];

  } else if (textField == self.field2) {

    [textField resignFirstResponder];

  }
  NSLog(@" sa");
  // [textField resignFirstResponder];
  return YES;
  }