fixed: 1.适配小屏幕机型

feature: 1.忘记密码新增语音和短信验证码切换功能

Ifish/controllers/erweima/QRCodeReaderView.m

@@ -159,7 +159,7 @@
     //用于说明的label
     UILabel * labIntroudction= [[UILabel alloc] init];
     labIntroudction.backgroundColor = [UIColor clearColor];
-    labIntroudction.frame=CGRectMake(0, 64+(heih-64-50*widthRate)/2, DeviceMaxWidth, 50*widthRate);
+    labIntroudction.frame=CGRectMake(0, (heih-64-50*widthRate)/2, DeviceMaxWidth, 50*widthRate);
     labIntroudction.textAlignment = NSTextAlignmentCenter;
     labIntroudction.textColor=[UIColor whiteColor];
     labIntroudction.text=@"将二维码置于矩形方框内";

Ifish/controllers/erweima/ScanViewController.m

@@ -60,7 +60,9 @@
     _bakbutton.frame = CGRectMake(0, 0, 47,44);
     [_bakbutton setImage:[UIImage imageNamed:@"back_btn"] forState:UIControlStateNormal];
     [_bakbutton addTarget: self action: @selector(backButtonEvent) forControlEvents: UIControlEventTouchUpInside];
-  
+    [_bakbutton setContentEdgeInsets:UIEdgeInsetsMake(0, 10, 0, -10)];
+    _bakbutton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
+
     
     UIBarButtonItem * lbbItem=[[UIBarButtonItem alloc]initWithCustomView:_bakbutton];
     self.navigationItem.leftBarButtonItem=lbbItem;