iPhone开发--用UITextField实现搜索框

来源：网络责任编辑：栏目编辑发表时间:2013-07-01 05:17　点击:次

因为界面美化的需要，原有的控件SearchBar控件太丑了，又懒的研究SearchBar控件的新样式，所以决定重写个搜索功能的控件。

创建个UITextField的类对象。

[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的文本发生变化时相应事件
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的文本发生变化时相应事件
设置ReturnKeyType为UIRetuirKeySearch ：
[cpp] [searchField setReturnKeyType:UIReturnKeySearch];
[searchField setReturnKeyType:UIReturnKeySearch];
设置UITextField的delegate为self：

[cpp] searchField.delegate=self;
searchField.delegate=self;
之后编写响应点击搜索按钮的响应事件的函数：

[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的文本内容发生变化时，处理事件函数
[cpp] - (void) textFieldDidChange:(UITextField*) TextField{
NSLog(@"textFieldDidChange textFieldDidChange");
if(![TextField.textisEqualToString:@""]) {
    delButton.hidden=NO; // 仿制searchbar后面的小叉叉
} else{
    delButton.hidden=YES;
}
}
- (void) textFieldDidChange:(UITextField*) TextField{
NSLog(@"textFieldDidChange textFieldDidChange");
if(![TextField.textisEqualToString:@""]) {
    delButton.hidden=NO; // 仿制searchbar后面的小叉叉
} else{
    delButton.hidden=YES;
}
}