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UIButton的使用

使用UIButton时需要注意的是:

1.UIButton的创建有专门的类方法(buttonWithType:,UILabel没有);

2.UIButton常用的属性包括:frame、titile、tag等;

3.UIButton使用addTarget方法关联处理方法,一个UIButton可以有多个不同的按钮响应方法,多个UIButton也可以共享一个处理方法(用tag做区分);

 

// 创建文件按钮- (void) createRectUI {    // 穿件圆角矩形按钮    UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];    btn1.frame = CGRectMake(100, 100, 100, 50);    [btn1 setTitle:@"按钮1" forState:UIControlStateNormal];    btn1.titleLabel.font = [UIFont systemFontOfSize:18];    [self.view addSubview:btn1];        UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];    btn2.frame = CGRectMake(100, 200, 100, 50);    [btn2 setTitle:@"按钮2" forState:UIControlStateNormal];    btn2.titleLabel.font = [UIFont systemFontOfSize:18];    [self.view addSubview:btn2];        btn1.tag = 101;    [btn1 addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];    btn2.tag = 102;    [btn2 addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];}- (void) btnPressed : (UIButton*) btn {    NSInteger tag = btn.tag;    if(tag == 101){        NSLog(@"btn1 pressed!");    }else{        NSLog(@"btn2 pressed!");    }}

  

UIButton的使用