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