自定义UITextField

      在创建UITextField 代码的时候，有时我们需要自定义其风格，比如在文本框中加入图标，改变文本字段的行为，可以通过重写的方法来将其实现，这些方法都会返回一个CGRect结构，该结构制定了文本字段每个部件的边界范围，可以修改placeHolder颜色，字体等；
     

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [super viewDidLoad];
    UIView *baseView = [[UIView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];
    [baseView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"second.jpg"]]];
    [self.view addSubview:baseView];
        self.field3 = [[UITextField alloc]initWithFrame:CGRectMake(80,280,220, 40)];
    [self.field3 setBorderStyle:UITextBorderStyleRoundedRect];//外框类型
    self.field3 .placeholder = @"请输入邮箱地址";//默认显示的字
    self.field3 .secureTextEntry = NO ;//是否以密码形式显示
    
    self.field3 .autocorrectionType = UITextAutocorrectionTypeNo;//设置是否启动自动提醒更正功能
    self.field3 .autocapitalizationType = UITextBorderStyleNone;
    self.field3 .returnKeyType = UIReturnKeyDone;//键盘返回类型
    self.field3 .clearButtonMode = UITextFieldViewModeWhileEditing;//编辑时会出现个修改X,点击可以将输入的所有内容清除
    self.field3 .delegate = self;
    self.field3 .keyboardType = UIKeyboardTypeDefault;//键盘显示类型
    // field.userInteractionEnabled = NO;
    self.field3 .contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//设置居中输入
    //field.scroll Enabled = YES;//是否可以拖动
    self.field3 .autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度
    UIImageView *imgv = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"email_img.png"]];
    imgv.frame = CGRectMake(5, 5, 30, 30);
    UIView *leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 1,39,38)];
    [leftView addSubview:imgv];
    self.field3.leftView = leftView;
    self.field3.leftViewMode = UITextFieldViewModeAlways;
    [self.view addSubview:self.field3 ];
    
    self.field1 = [[UITextField alloc]initWithFrame:CGRectMake(80,340,220, 40)];
    [self.field1 setBorderStyle:UITextBorderStyleRoundedRect];//外框类型
    self.field1 .placeholder = @"请输入登陆账号";//默认显示的字
    
    self.field1 .secureTextEntry = NO;//是否以密码形式显示
    
    self.field1 .autocorrectionType = UITextAutocorrectionTypeNo;//设置是否启动自动提醒更正功能
    self.field1 .autocapitalizationType = UITextBorderStyleNone;
    self.field1 .returnKeyType = UIReturnKeyDone;//键盘返回类型
    self.field1 .clearButtonMode = UITextFieldViewModeWhileEditing;//编辑时会出现个修改X,点击可以将输入的所有内容清除
    self.field1 .delegate = self;
    self.field1 .keyboardType = UIKeyboardTypeNumberPad;//键盘显示类型
    // field.userInteractionEnabled = NO;
    self.field1 .contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//设置居中输入
    //field.scroll Enabled = YES;//是否可以拖动
    self.field1 .autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度
    UIImageView *imgv1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"user_img.png"]];
    imgv1.frame = CGRectMake(5, 5, 30, 30);
    UIView *leftView1 = [[UIView alloc]initWithFrame:CGRectMake(0, 1,39,38)];
    [leftView1 addSubview:imgv1];
    self.field1.leftView = leftView1;
    self.field1.leftViewMode = UITextFieldViewModeAlways;
    [self.view addSubview:self.field1];
    
    
    self.field2 = [[UITextField alloc]initWithFrame:CGRectMake(80,400,220, 40)];
    [self.field2 setBorderStyle:UITextBorderStyleRoundedRect];//外框类型
    self.field2 .placeholder = @"请输入登陆密码";//默认显示的字
    self.field2 .secureTextEntry = YES;//是否以密码形式显示
    
    self.field2 .autocorrectionType = UITextAutocorrectionTypeNo;//设置是否启动自动提醒更正功能
    self.field2 .autocapitalizationType = UITextBorderStyleNone;
    self.field2 .returnKeyType = UIReturnKeyDone;//键盘返回类型
    self.field2 .clearButtonMode = UITextFieldViewModeWhileEditing;//编辑时会出现个修改X,点击可以将输入的所有内容清除
    self.field2 .delegate = self;
    self.field2 .keyboardType = UIKeyboardTypeDefault;//键盘显示类型
    // field.userInteractionEnabled = NO;
    self.field2 .contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//设置居中输入
    //field.scroll Enabled = YES;//是否可以拖动
    self.field2 .autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度
    UIImageView *imgv3 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"pass_img.png"]];
    imgv3.frame = CGRectMake(5, 5, 30, 30);
    UIView *leftView3 = [[UIView alloc]initWithFrame:CGRectMake(0, 1,39,38)];
    [leftView3 addSubview:imgv3];
    self.field2.leftView = leftView3;
    self.field2.leftViewMode = UITextFieldViewModeAlways;
    [self.view addSubview:self.field2];
    
    UIButton *land = [UIButton buttonWithType:UIButtonTypeCustom];
    [land setAlpha:1.0f];
    [land setTitle:@"确认注册" forState:(UIControlStateNormal)];
    [land setTitleColor:[UIColor whiteColor] forState:(UIControlStateNormal)];
    [land.layer setMasksToBounds:YES];
    [land setFrame:CGRectMake(120,480,120,40)];
    [land.layer setCornerRadius:10.0f];
    [land.layer setBorderWidth:2];
    //设置边界颜色
    CGColorSpaceRef  colorSpaceRef= CGColorSpaceCreateDeviceRGB();
    CGColorRef color = CGColorCreate(colorSpaceRef,(CGFloat[]){0,0,1,1});
    [land.layer setBorderColor:color];
    [land addTarget:self action:@selector(land2:) forControlEvents:UIControlEventTouchUpInside];
    [self.view  addSubview:land];
   
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
    // Dispose of any resources that can be recreated.
}

-(void)land2:(UIButton *) land
{
    
    
}
-(void)textFieldDidBeginEditing:(UITextField *)textField{
    //当开始点击textField会调用的方法
    
    
}
-(void)textFieldDidEndEditing:(UITextField *)textField{
    //当textField编辑结束时调用的方法
    
    
}

//– clearButtonRectForBounds:　　//重写来重置clearButton位置,改变size可能导致button的图片失真
-(CGRect)clearButtonRectForBounds:(CGRect)bounds   //控制清除按钮的位置
{
    return CGRectMake(bounds.origin.x + bounds.size.width - 50, bounds.origin.y + bounds.size.height -20, 16, 16);
    
}

//– placeholderRectForBounds:　　//重写来重置占位符区域

-(CGRect)placeholderRectForBounds:(CGRect)bounds   //控制placeHolder的位置，左右缩20
{
     return CGRectInset(bounds, 20, 0);
    
    //CGRect inset = CGRectMake(bounds.origin.x+250, bounds.origin.y, bounds.size.width -10, bounds.size.height);   //等同于上面的代码方便理解bounds的定义；
    //return inset;
}

//– textRectForBounds: 重写来重置文字区域

-(CGRect)textRectForBounds:(CGRect)bounds  //控制显示文本的位置
{
     return CGRectInset(bounds, 50, 0);
    //    CGRect inset = CGRectMake(bounds.origin.x+190, bounds.origin.y, bounds.size.width -10, bounds.size.height);//更好理解些
   //    return inset;
    
}

//– editingRectForBounds:　　//重写来重置编辑区域

-(CGRect)editingRectForBounds:(CGRect)bounds  //控制编辑文本的位置
{
    
     return CGRectInset( bounds, 10 , 0 );
    //    CGRect inset = CGRectMake(bounds.origin.x +10, bounds.origin.y, bounds.size.width -10, bounds.size.height);
   //    return inset;
}

- (CGRect)leftViewRectForBounds:(CGRect)bounds   //控制左视图位置

{
    
   //    CGRect inset = CGRectMake(bounds.origin.x +10, bounds.origin.y, bounds.size.width-250, bounds.size.height);
   //    return inset;
     return CGRectInset(bounds,50,0);
}

//– drawPlaceholderInRect:　　//重写改变绘制占位符属性.重写时调用super可以按默认图形属性绘制,若自己完全重写绘制函数，就不用调用super了
- (void)drawPlaceholderInRect:(CGRect)rect   //控制placeHolder的颜色、字体

{
    [[UIColor orangeColor] setFill];
    
    // [[self.field.placeholder ] drawInRect:rectwithFont:[UIFontsystemFontOfSize:20]];
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    //按下Done按钮的调用方法，我们让键盘消失
    [textField resignFirstResponder];
    return YES;
}

@end

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