IOS 开发笔记 2018-03-20

一 IOS 系统控件

UILabel 文本标签

初始化:：UILabel * label = [[UILabel alloc] init];

1.设置文本信息：label.text = @"文本";

或：NSString * text = @"name"; label.text = text;

2. 设置文本颜色：label.textColor = [UIColor blackColor]; 

3. 设置文本位置：lavbel.frame = CGRectMake(100,100,100,30);(x,y,width,hight)

4. 设置背景颜色：label.backgroundColor = [UIColor clearColor]; 透明

5. 设置文本字体大小：label.font = [UIFont systemFontOfSize: 20]; 

6. 设置文本字体大小自适应控件宽度：label.adjustsFontSizeToFitWidth = YES;

7. 设置文本居中显示：label.textAlignment = NSTextAlignmentCenter;

8. 将文本加入主页面显示：[self.view addSubview: label];

UIButton 按钮

初始化：UIButton * button = [UIButton buttonWithType: UIButtonTypeCustom]; 系统风格按钮

1. 设置按钮位置：button.frame = CGRectMake(100, 100, 100, 30);

2. 设置按钮常规状态：[button setTitle: @"" forState: UIControlStateNormal];

3. 设置按钮常规颜色：[button setTitleColor: [UIColor blackColor] forState: UIControlStateNormal];

4. 设置按钮文本字体大小：button.titleLabel.font = [UIFont systemFontOfSize: 20];

5. 设置按钮背景颜色：button.backgroundColor = [UIColor clearColor];

6. 设置按钮图片：[button setImage: [UIImage imageNamed: @"wifi_button.png"] forState: UIControlStateNormal];

7. 设置当按钮不可用时变灰：button.adjustsImageWhenDisabled = YES;

8. 设置点击按钮时高亮：button.showsTouchWhenHighlighted = YES;

9. 设置按钮边框宽度：button.layer.borderWidth = 2;

10.   button.layer.cornerRadius = 5;

11.   button.clipsToBounds = YES;

12.   button.layer.borderColor = [UIColor clearColor].CGColor;

13. 添加按钮点击事件响应：[button addTarget:self action:@selector(btnLoginDown) forControlEvents: UIControlEventTouchUpInside];

14. [self.view addSubview: button];