我的iOS学习历程 - 自定义视图

当你要创建一个例如左边是lable右边是textField的时候怎么样简便一点呢?我们就可以自定义一个视图来将label和textField放在一个view里,让我们以此来举例:

//  重写初始化方法 在初始化LTView的同时把label也加上去
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
//  获取动态高度
CGFloat height = frame.size.height;
//  获取动态宽度
CGFloat width = frame.size.width;
self.label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, width / 5, height)];
self.label.backgroundColor = [UIColor whiteColor];
[self addSubview:self.label];
[_label release];
self.textField = [[UITextField alloc]initWithFrame:CGRectMake(width / 5 + 20, 0, (2 * width / 3) - 20, height)];
self.textField.backgroundColor = [UIColor whiteColor];
self.textField.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.textField];
[_textField release];
}
return self;
}

#import "LoginView.h"
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
#define kHighDistance  30 //  行间距
#define kButtonDistance 50  //  button间距
@implementation LoginView
- (void)dealloc {
[_userNameLTView release];
[_passwordLTView release];
[_registerButton release];
[_findPasswordButton release];
[_loadingButton release];
[super dealloc];
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.userNameLTView = [[LTView alloc]initWithFrame:CGRectMake((kScreenWidth - 300) / 2, 100, 300, 50)];
[self addSubview:self.userNameLTView];
[_userNameLTView release];
self.passwordLTView = [[LTView alloc]initWithFrame:CGRectMake(self.userNameLTView.frame.origin.x, self.userNameLTView.frame.origin.y + self.userNameLTView.frame.size.height + kHighDistance, self.userNameLTView.frame.size.width, self.userNameLTView.frame.size.height)];
[self addSubview:self.passwordLTView];
[self.passwordLTView release];
//  循环button
for (int i = 0; i < 3; i ++) {
UIButton *button = [UIButton buttonWithType:(UIButtonTypeCustom)];
button.frame = CGRectMake(50 + (i * 100), 300, 80, 80) ;
button.backgroundColor = [UIColor whiteColor];
//  加标签 方便取出button 与属性的button 相对应
button.tag = i + 100;
[self addSubview:button];
}
//  属性与循环的Button进行关联
self.loadingButton = (UIButton *)[self viewWithTag:100];
self.findPasswordButton = (UIButton *)[self viewWithTag:101];
self.registerButton = (UIButton *)[self viewWithTag:102];
}
return self;
}

//  重新布局子视图 layoutSubviews
//  frame发生变化的时候 会触发该方法
- (void)layoutSubviews {
//  因为不知道父类的方法做了什么
//  所以在重写的时候 先调用一下父类的方法
//  然后再写咱们自己的
[super layoutSubviews];

//  frame发生变化 相当于横屏了
//  这时需要重新布局
//  判断是竖屏还是横屏
//  1.把应用程序取出来
//  2.判断一下当前应用程序 屏幕的朝向

//  取出应用程序 sharedApplication 单例方法的命名规范share+
UIApplication *app = [UIApplication sharedApplication];
//  判断方向 statusBarOrientation
if(app.statusBarOrientation == UIInterfaceOrientationPortrait || app.statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown) {
self.passwordLTView.frame = CGRectMake(self.userNameLTView.frame.origin.x, self.userNameLTView.frame.origin.y + self.userNameLTView.frame.size.height + kHighDistance, self.userNameLTView.frame.size.width, self.userNameLTView.frame.size.height);
}else {
self.passwordLTView.frame = CGRectMake(self.userNameLTView.frame.origin.x + self.userNameLTView.frame.size.width + 20, self.userNameLTView.frame.origin.y, self.userNameLTView.frame.size.width, self.userNameLTView.frame.size.height);
}
}