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ios视图frame和bounds的对比

关键词:iosframebounds  阅读(1529) 赞(14)

[摘要]本文是对ios视图frame和bounds的对比的讲解,对学习IOS苹果软件开发有所帮助,与大家分享。

bounds坐标:自己定义的坐标系统,setbound指明了本视图左上角在该坐标系统中的坐标,

       默认值(0,0)

frame坐标: 子视图左上角在父视图坐标系统(bounds坐标系统)中的坐标,默认值(0,0)

子视图实际位置=父视图实际位置-父视图bounds坐标+子视图frame坐标

一、bounds

  只影响“子视图”相对屏幕的位置,修改时不会影响自身相对屏幕的位置

  1、父视图bounds坐标为(0,0)时

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
    
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
}

  

  2、父视图bounds坐标为(-20,-20)时 

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
    [self.view setBounds:CGRectMake(-20, -20, 320, 568)];
    
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
}

  

二、frame

  修改时改变了自己的在父视图坐标系统(bounds坐标系统)的位置,自身位置和

  子视图位置都会被改变。

  1、父视图frame坐标(0,0)

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
    
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    view2.backgroundColor = [UIColor yellowColor];
    [view1 addSubview:view2];
    
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view1.frame),NSStringFromCGRect(view1.bounds));
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view2.frame),NSStringFromCGRect(view2.bounds));
}

  

  2、父视图frame坐标(60,60)

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(60, 60, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
    
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    view2.backgroundColor = [UIColor yellowColor];
    [view1 addSubview:view2];
    
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view1.frame),NSStringFromCGRect(view1.bounds));
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view2.frame),NSStringFromCGRect(view2.bounds));
}

  

三、说明

  根视图只能修改bounds坐标,而不可以修改frame坐标

  以下self.view为根视图

  1、初始状态

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
}

  

  2、修改bounds坐标:有效

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
    CGRect viewBounds = self.view.bounds;
    viewBounds.origin.y=-40;
    viewBounds.origin.x=-40;
    self.view.bounds=viewBounds;
    
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
}

   

   

  3、修改frame坐标:无效

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 200, 260)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];
    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y=60;
    viewFrame.origin.x=60;
    self.view.frame=viewFrame;
    
    NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
}

  

  



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