UILable是今天回憶的第一節(jié)，之前所學(xué)的都忘得差不多了，我遠(yuǎn)遠(yuǎn)沒(méi)想到一個(gè)標(biāo)簽也有很多很多的含義

 //UILable

   UILabel *label = [[UILabel alloc]init];//初始化文本標(biāo)簽

   label.frame = CGRectMake(20.0, 20.0, 120, 80);//設(shè)置大小

   label.backgroundColor = [UIColor blackColor];//設(shè)置背景為黑色

   label.text = @"你好";

   label.textColor = [UIColor whiteColor];//設(shè)置文字顏色

   label.textAlignment = NSTextAlignmentCenter;

   [self.view addSubview:label];//添加到視圖

按鈕是回憶的第二節(jié),一個(gè)Button想要完全的顯示需要二十到三十行代碼

 //UIButton

     UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];//[[UIButton alloc]init];//初始化按鈕標(biāo)簽

     //    UIButton *button1 = [[UIButton alloc]init];//初始化按鈕標(biāo)簽

     button.frame = CGRectMake(20.0, 20.0, 120, 80);//設(shè)置大小

     button.backgroundColor = [UIColor blackColor];//設(shè)置背景為黑色

     [button setTitle:@"你好" forState:UIControlStateNormal];

     //按鈕添加點(diǎn)擊事件

     [button addTarget:self action:@selector(clickButton) forControlEvents:UIControlEventTouchDown];

     [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchDown];

     //按鈕 狀態(tài) ，設(shè)置圖片

     //    label.text = @"你好";

     //    label.textColor = [UIColor whiteColor];//設(shè)置文字顏色

     //    label.textAlignment = NSTextAlignmentCenter;

     [self.view addSubview:button];//添加到視圖

而我敲到這的時(shí)候，我便開(kāi)始在想，如何的使它看起來(lái)更加的像一個(gè)真正的按鈕，接下來(lái)便開(kāi)始利用起了if語(yǔ)句也就是我們常說(shuō)的如果，想起在剛學(xué)C語(yǔ)言的時(shí)候‘如果語(yǔ)句’有很多種，直到今天真正利用的也就一個(gè)if了

-(void)click:(UIButton*) btn{

//    btn.selected = YES;

    NSLog(@"你好");

    if([btn.titleLabel.textisEqualToString:@"Hello"]) {

        [btnsetTitle:@"你好" forState:UIControlStateNormal];

    }else{

        [btnsetTitle:@"Hello" forState:UIControlStateNormal];

    }

    /*

     if ([btn.titleLabel.text isEqualToString:@"Hello"]) {

     [btn setTitle:@"你好" forState:UIControlStateNormal];

     

     }else{

     [btn setTitle:@"Hello" forState:UIControlStateSelected];

     

     }

*/

}