#import <UIKit/UIKit.h>
@interface UITestViewController : UIViewController <UITextViewDelegate>
{
}
@end
#import "UITestViewController.h"
UIScrollView *myScrollView;
UITextView *myTextView;
@implementation UITestViewController
-(void)buttonClick:(id)sender
{
[myTextView resignFirstResponder];
}
- (void)viewDidLoad {
[super viewDidLoad];
CGRect viewRect = [self.view bounds];
myScrollView = [[UIScrollView alloc] initWithFrame:viewRect];
myScrollView.contentSize = viewRect.size;
[self.view addSubview:myScrollView];
CGRect buttonFrame = CGRectMake(10,10,60,32);
UIButton *keyboardToggle = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[keyboardToggle setTitle:@"hide" forState:UIControlStateNormal];
[keyboardToggle addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
keyboardToggle.frame = buttonFrame;
[myScrollView addSubview:keyboardToggle];
CGRect textRect = CGRectMake(10,60,300,200);
myTextView = [[UITextView alloc] initWithFrame:textRect];
myTextView.font = [UIFont systemFontOfSize:22.0];
myTextView.keyboardType = UIKeyboardTypeDefault;
myTextView.returnKeyType = UIReturnKeyGo;
/uncomment to enable data detectors
//myTextView.text = @"this is a link: http://google.com ";
//myTextView.dataDetectorTypes = UIDataDetectorTypeAll;
//myTextView.enabled = NO;
myTextView.delegate = self;
[myScrollView addSubview:myTextView];
[myTextView release];
[myScrollView release];
}
- (void)textViewDidBeginEditing:(UITextView *)textView
{
float keyboardHeight;
if ([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait | UIDeviceOrientationPortraitUpsideDown)
keyboardHeight = 216.0;
else
keyboardHeight = 162.0;
CGRect textViewRect = textView.frame;
float textViewBottom = textViewRect.origin.y + textViewRect.size.height;
CGRect viewRect = [myScrollView bounds];
float keyboardTop = viewRect.size.height-keyboardHeight;
float scrollOffset = fabs(textViewBottom - keyboardTop);
[myScrollView setContentOffset:CGPointMake(0, scrollOffset) animated:YES];
}
- (void)textViewDidEndEditing:(UITextView *)textView
{
[myScrollView setContentOffset:CGPointMake(0, 0) animated:YES];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
一种简单的按回车键后，键盘弹起的操作，实现UITextViewDelegate的下属方法：
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range
replacementText:(NSString *)text {
if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}