UITextView里换行实现（键盘上附加一个完成按钮）

// 1、创建UITextView

UITextView* tv = [[UITextView
alloc] initWithFrame:CGRectMake(10,
10,
300,
200)];

[tv setFont:[UIFont
systemFontOfSize:19.0]];

tv.tag =
1001;

tv.returnKeyType =
UIReturnKeyNext; //
下一行

tv.delegate =
self;

[self.view
addSubview:tv];

// 2、键盘上方附加一个toolbar，toolbar上有个完成按钮

UIToolbar* keyboardDoneButtonView = [[UIToolbar
alloc] init];

keyboardDoneButtonView.barStyle =
UIBarStyleBlack;

keyboardDoneButtonView.translucent =
YES;

keyboardDoneButtonView.tintColor =
nil;

[keyboardDoneButtonView sizeToFit];

// toolbar上的2个按钮

UIBarButtonItem *SpaceButton=[[UIBarButtonItem
alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:nil
action:nil];
// 让完成按钮显示在右侧

UIBarButtonItem* doneButton = [[UIBarButtonItem
alloc]
initWithTitle:@"完成"

style:UIBarButtonItemStyleBordered
target:self

action:@selector(pickerDoneClicked)];

[keyboardDoneButtonView setItems:[NSArray
arrayWithObjects:SpaceButton, doneButton,
nil]];

tv.inputAccessoryView = keyboardDoneButtonView;

// 3、键盘上方附加的完成按钮触发函数

-(void)pickerDoneClicked
{

UITextView* view = (UITextView*)[self.view
viewWithTag:1001];

[view resignFirstResponder];
}