UITextField/UITextView 选中时改变边框颜色

#import "ViewController.h"

// first import QuartCore.framework and then add this line
#import <QuartzCore/QuartzCore.h>   

@interface ViewController () <UITextFieldDelegate, UITextViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // UITextField
    UITextField *textField = [[UITextField alloc]
                              initWithFrame:CGRectMake(20, 20, 280, 35)];
    [self initialTextField:textField];
    [textField setDelegate:self];
    [self.view addSubview:textField];
    [textField release];
    
    // UITextView
    UITextView *textView = [[UITextView alloc]
                            initWithFrame:CGRectMake(20, 100, 280, 150)];
    [self initialTextView:textView];
    [textView setDelegate:self];
    [self.view addSubview:textView];
    [textView release];
}

- (void)initialTextField:(UITextField *)textField
{
    textField.layer.cornerRadius = 8.0f;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;   
    textField.placeholder = @"Place holder text";
    // textField.textAlignment = NSTextAlignmentLeft;  default
    
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.layer.borderWidth = 2.0f;
    textField.layer.borderColor = [[UIColor darkGrayColor] CGColor];
}

- (void)initialTextView:(UITextView *)textView
{
    // textView.textAlignment = NSTextAlignmentLeft;  default
    textView.layer.cornerRadius = 8.0f;
    // textView.layer.masksToBounds = YES;
    
    textView.layer.borderWidth= 2.0f;
    textView.layer.borderColor=[[UIColor darkGrayColor] CGColor];
}


#pragma mark - UITextFieldDelegate
// 获取第一响应者时调用
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField   
{
    textField.layer.cornerRadius = 8.0f;
    // textField.layer.masksToBounds=YES;
    textField.layer.borderColor=[[UIColor blueColor] CGColor];
    return YES;
}

// 失去第一响应者时调用
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    textField.layer.borderColor=[[UIColor darkGrayColor] CGColor];
    return YES;
}

// 按enter时调用
- (BOOL)textFieldShouldReturn:(UITextField *)textField         
{
    [textField resignFirstResponder];
    return YES;
}


#pragma mark - UITextViewDelegate
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView;
{
    textView.layer.borderColor = [[UIColor blueColor] CGColor];
    return YES;
}

- (BOOL)textViewShouldEndEditing:(UITextView *)textView
{
    textView.layer.borderColor=[[UIColor darkGrayColor] CGColor];
    return YES;
}

#pragma mark - touch 
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    for (UIView *view in [self.view subviews]) {
        [view resignFirstResponder];
    }
    // [self.view resignFirstResponder];  // No
}

@end