wdTextField.placeholder = @"请输入密码";
UIImageView *imageViewPwd=[[UIImageView alloc]initWithFrame:CGRectMake(-20, 0, 32, 24)];
imageViewPwd.image=[UIImage imageNamed:@"k_06"];
pwdTextField.leftView=imageViewPwd;
pwdTextField.leftViewMode=UITextFieldViewModeAlways; //此处用来设置leftview现实时机
pwdTextFidld.borderStyle = UITextBorderStyleRoundedRect;
pwdTextField.contentVerticalAlignment =
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