FirstApp，iphone开发学习总结3，UIButton简单的操作

相同的，为了Tab init：

- (id)init {
self = [super init];
if (self) {
[self setTitle:@"按钮展示"];

UIImage *img = [UIImage imageNamed:@""];
[[self tabBarItem] setImage:img];
}
return self;
}在- (void)viewDidLoad中，创建2个按钮（Left and Right），设置Left的Tag为0，Right的Tag为1（区分谁点击），点击执行onClick事件：

- (void)viewDidLoad
{
UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
leftBtn.frame = CGRectMake(40.0, 100.0, 100.0, 30.0);
[leftBtn setTitle:@"Left" forState:UIControlStateNormal];
[leftBtn addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];
[leftBtn setTag:0];

UIButton *rightBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
rightBtn.frame = CGRectMake(180.0, 100.0, 100.0, 30.0);
[rightBtn setTitle:@"Right" forState:UIControlStateNormal];
[rightBtn addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];
[rightBtn setTag:1];

[[self view] addSubview:leftBtn];
[[self view] addSubview:rightBtn];
}添加onClick://@selector(onClick:)，添加了：，如果事件为- （void）onClick，则不需要添加

- (void)onClick:(UIButton *)sender
{
switch ([sender tag]) {
case 0:
[self alert:@"左键"];
break;
case 1:
[self alert:@"右键"];
break;
}
}添加alert方法：

- (void)alert:(NSString *)str
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"您点击了" message:str delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Cancel", nil];
[alert show];
[alert release];
}

实现的效果就是谁点击，提示谁。

求指点。