iOS Common technology-Login screen

//
SXTTextField.h
04-uitextfield Practice
//
Created by Andezhou on 16/1/8.
Copyright (c) 2016 Zhou Ande. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface Sxttextfield:uitextfield

Set the left picture name
@property (copy, nonatomic) NSString *leftimgname;

/**
* @brief Construction method
*
* @param frame position width high
* @param imgname
*
*/
-(Instancetype) initWithFrame: (CGRect) frame
Leftimgname: (NSString *) leftimgname;

@end
/************************************************/

//
Sxttextfield.m
04-uitextfield Practice
//
Created by Andezhou on 16/1/8.
Copyright (c) 2016 Zhou Ande. All rights reserved.
//

#import "SXTTextField.h"

@interface Sxttextfield ()

@property (Strong, nonatomic) Uiimageview *leftimageview;

@end

@implementation Sxttextfield

#pragma mark-
#pragma mark Lifecycle
-(Instancetype) initWithFrame: (CGRect) frame
Leftimgname: (NSString *) leftimgname
{
Self.leftimgname = Leftimgname;

return [self initwithframe:frame];
}

-(Instancetype) initWithFrame: (CGRect) frame
{
if (self = [Super Initwithframe:frame]) {
Set XX
Self.clearbuttonmode = Uitextfieldviewmodealways;
Second input erase content
self.clearsonbeginediting = YES;

return mode
Self.returnkeytype = Uireturnkeydone;

Set a background picture
Self.background = [UIImage imagenamed:@ "background"];

Set left View
Self.leftview = Self.leftimageview;
Set left view always exists
Self.leftviewmode = Uitextfieldviewmodealways;
}
return self;
}

#pragma mark-
#pragma Mark Init methods
-(Uiimageview *) Leftimageview
{
if (!_leftimageview) {
_leftimageview = [[Uiimageview alloc] Initwithframe:cgrectmake (20, 4, 45, 36)];
_leftimageview.backgroundcolor = [Uicolor Clearcolor];
_leftimageview.contentmode = Uiviewcontentmodecenter;
}
return _leftimageview;
}

#pragma mark-
#pragma mark Set
-(void) Setleftimgname: (NSString *) leftimgname
{
_leftimgname = Leftimgname;

Show the picture on the Leftview
Self.leftImageView.image = [UIImage imagenamed:leftimgname];
}

@end
/***********************************************************/

//
Uicolor+extension.h
Nine Gongge
//
Created by Andezhou on 16/1/3.
COPYRIGHT©2016 year Zhou Ande. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface Uicolor (Extension)

+ (Uicolor *) colorwithhexstring: (NSString *) color;
+ (Uicolor *) colorwithhexstring: (NSString *) color alpha: (cgfloat) Alpha;


@end
/*************************************************************/

//
Uicolor+extension.m
Nine Gongge
//
Created by Andezhou on 16/1/3.
COPYRIGHT©2016 year Zhou Ande. All rights reserved.
//

#import "Uicolor+extension.h"
#define Default_void_color [Uicolor Whitecolor]

@implementation Uicolor (Extension)

#000000
+ (Uicolor *) colorwithhexstring: (NSString *) color alpha: (cgfloat) Alpha
{
NSString *cstring = [[Color Stringbytrimmingcharactersinset:[nscharacterset Whitespaceandnewlinecharacterset]] Uppercasestring];

if ([cString length] < 6)
return default_void_color;
if ([CString hasprefix:@ "#"])
cString = [cString substringfromindex:1];
if ([cString length]! = 6)
return default_void_color;

Nsrange range;
range.location = 0;
Range.length = 2;
NSString *rstring = [cString substringwithrange:range];

Range.location = 2;
NSString *gstring = [cString substringwithrange:range];

Range.location = 4;
NSString *bstring = [cString substringwithrange:range];


unsigned int r, G, B;
[[Nsscanner scannerwithstring:rstring] scanhexint:&r];
[[Nsscanner scannerwithstring:gstring] scanhexint:&g];
[[Nsscanner scannerwithstring:bstring] scanhexint:&b];

return [Uicolor colorwithred: ((float) r/255.0f)
Green: ((float) g/255.0f)
Blue: ((float) b/255.0f)
Alpha:alpha];
}

+ (Uicolor *) colorwithhexstring: (NSString *) color
{
return [Uicolor Colorwithhexstring:color alpha:1.0];
}
@end
/**************************************************/

//
Viewcontroller.m
04-uitextfield Practice
//
Created by Andezhou on 16/1/8.
Copyright (c) 2016 Zhou Ande. All rights reserved.
//

#import "ViewController.h"
#import "Uicolor+extension.h"
#import "SXTTextField.h"

static Nsuinteger kmargin = 20;
#define Ktextfieldwidth [UIScreen mainscreen].bounds.size.width-2*kmargin

@interface Viewcontroller () <UITextFieldDelegate>

@property (Strong, nonatomic) Sxttextfield *usernametextfield, *passwordtextfield;
@property (Strong, nonatomic) UIButton *loginbtn;

@end

@implementation Viewcontroller


-(Sxttextfield *) Usernametextfield
{
if (!_usernametextfield) {
_usernametextfield = [[Sxttextfield alloc] Initwithframe:cgrectmake (Kmargin, N, Ktextfieldwidth, 44)];
_usernametextfield.delegate = self;
_usernametextfield.leftimgname = @ "UserName";
_usernametextfield.placeholder = @ "Please enter the phone number";
_usernametextfield.keyboardtype = Uikeyboardtypenumberpad;
}
return _usernametextfield;
}

-(Sxttextfield *) Passwordtextfield
{
if (!_passwordtextfield) {
CGRect frame = CGRectMake (Kmargin, Cgrectgetmaxy (_usernametextfield.frame) +, ktextfieldwidth, 44);
_passwordtextfield = [[Sxttextfield alloc] initwithframe:frame leftimgname:@ "password"];
_passwordtextfield.delegate = self;
Password mode
_passwordtextfield.securetextentry = YES;
_passwordtextfield.placeholder = @ "Please enter password";
}
return _passwordtextfield;
}

-(UIButton *) loginbtn
{
if (!_LOGINBTN) {
CGFloat pointy = Cgrectgetmaxy (_passwordtextfield.frame) + 50;
_LOGINBTN = [UIButton buttonwithtype:uibuttontypecustom];
_loginbtn.frame = CGRectMake (Kmargin, Pointy, ktextfieldwidth, 44);
[_loginbtn settitle:@ "Login" forstate:uicontrolstatenormal];
_loginbtn.titlelabel.font = [Uifont boldsystemfontofsize:16];
[_loginbtn setbackgroundimage:[uiimage imagenamed:@ "Beijing"] forstate:uicontrolstatenormal];
[_loginbtn addtarget:self Action: @selector (loginaction:) forcontrolevents:uicontroleventtouchupinside];
_loginbtn.layer.cornerradius = 4.0f;
_loginbtn.layer.maskstobounds = YES;
_loginbtn.enabled = NO;
}
return _loginbtn;
}

#pragma mark-
#pragma Mark Loginaction
-(void) Loginaction: (UIButton *) btn
{
NSLog (@ "username:%@ password:%@", _usernametextfield.text, _passwordtextfield.text);
}

#pragma mark-
#pragma Mark Uitextfielddelegate
-(BOOL) TextField: (Uitextfield *) TextField Shouldchangecharactersinrange: (nsrange) range replacementstring: ( NSString *) string
{
if ([_passwordtextfield.text isequaltostring:@ ""] | | [_usernametextfield.text isequaltostring:@ ""]) {
_loginbtn.enabled = NO;
}else{
_loginbtn.enabled = YES;
}

return YES;
}

-(BOOL) Textfieldshouldreturn: (Uitextfield *) TextField
{
[Self.view Endediting:yes];
return YES;
}

#pragma mark-
#pragma mark Lifecycle
-(void) Viewdidload {
[Super Viewdidload];
Self.view.backgroundColor = [Uicolor colorwithhexstring:@ "#f7f8f3"];
[Self.view AddSubview:self.userNameTextField];
[Self.view AddSubview:self.passwordTextField];
[Self.view AddSubview:self.loginBtn];

}

-(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *) event
{
[Self.view Endediting:yes];
}

-(void) didreceivememorywarning {
[Super didreceivememorywarning];
Dispose of any resources the can be recreated.
}

@end
/***************************************************************/

iOS Common technology-Login screen