UIButton奇怪的行为

Question

我创建了一个按钮

uploadBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    uploadBtn.frame = CGRectMake(35, 340, 250, 40);
    [uploadBtn setTitle:@"Upload" forState:UIControlStateNormal];
    [uploadBtn addTarget:self action:@selector(callUpload) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:uploadBtn];

采取行动

-(void)callUpload
{
    UploadViewController *uploadObj = [[UploadViewController alloc]init];
    [self.navigationController pushViewController:uploadObj animated:YES];


}

但是当我按下按钮时没有事件发生。请帮忙

Answer 1

Btn的方法应该包括发件人。

更新此行。

[uploadBtn addTarget:self action:@selector(callUpload:) forControlEvents:UIControlEventTouchUpInside];

调用方法，

-(void)callUpload : (id) sender
{
    UploadViewController *uploadObj = [[UploadViewController alloc]init];
    [self.navigationController pushViewController:uploadObj animated:YES];
}