因為界面美化的需要，原有的控件SearchBar控件太丑了，又懶的研究SearchBar控件的新樣式，所以決定重寫個搜索功能的控件。

創建個UITextField的類對象。

[cpp] searchField= [[[UITextField alloc]initWithFrame:CGRectMake(0,5,320,36)] autorelease]; 
searchField.textColor= [UIColorcolor WithRed:0.0/255.0 green:103.0/255.0 blue:155.0/255.0 alpha:1.0]; 
searchField.font= [UIFont systemFontOfSize:16] ; 
searchField.backgroundColor= [UIColor blueColor] ; 
searchField.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter;   
[searchField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged]; // textField的文本發生變化時相應事件 
searchField= [[[UITextField alloc]initWithFrame:CGRectMake(0,5,320,36)] autorelease];
searchField.textColor= [UIColorcolor WithRed:0.0/255.0 green:103.0/255.0 blue:155.0/255.0 alpha:1.0];
searchField.font= [UIFont systemFontOfSize:16] ;
searchField.backgroundColor= [UIColor blueColor] ;
searchField.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter; 
[searchField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged]; // textField的文本發生變化時相應事件
設置ReturnKeyType為UIRetuirKeySearch ：
[cpp] [searchField setReturnKeyType:UIReturnKeySearch]; 
[searchField setReturnKeyType:UIReturnKeySearch];
設置UITextField的delegate為self：
 
[cpp] searchField.delegate=self; 
searchField.delegate=self;
之後編寫響應點擊搜索按鈕的響應事件的函數：

[cpp] - (BOOL)textFieldShouldReturn:(UITextField*)theTextField { 
  [theTextField resignFirstResponder]; 
  NSLog(@"do something what you want"); 
  returnYES; 
} 
- (BOOL)textFieldShouldReturn:(UITextField*)theTextField {
  [theTextField resignFirstResponder];
  NSLog(@"do something what you want");
  returnYES;
}textField的文本內容發生變化時，處理事件函數
[cpp] - (void) textFieldDidChange:(UITextField*) TextField{ 
  NSLog(@"textFieldDidChange textFieldDidChange"); 
  if(![TextField.textisEqualToString:@""]) { 
    delButton.hidden=NO;  // 仿制searchbar後面的小叉叉  
  } else{ 
    delButton.hidden=YES; 
  } 
} 
- (void) textFieldDidChange:(UITextField*) TextField{
  NSLog(@"textFieldDidChange textFieldDidChange");
  if(![TextField.textisEqualToString:@""]) {
    delButton.hidden=NO;  // 仿制searchbar後面的小叉叉
  } else{
    delButton.hidden=YES;
  }
}

哈，當然本人還是參考了下面的一位高人的idea：http://forums.macrumors.com/archive/index.php/t-523664.html

備注：此文章之前發布在baidu上，但是氣不過百度的排版樣式，轉戰csdn。

摘自 zcl369369的專欄