ios視圖frame和bounds的對比

bounds座標：本身定義的座標系統，setbound指明瞭本視圖左上角在該座標系統中的座標，

　　　　　　  默認值（0，0）

frame座標：  子視圖左上角在父視圖座標系統（bounds座標系統）中的座標，默認值（0，0）

子視圖實際位置＝父視圖實際位置－父視圖bounds座標＋子視圖frame座標

1、bounds

　　隻影響「子視圖」相對屏幕的位置，修改時不會影響自身相對屏幕的位置

　　一、父視圖bounds座標爲（0，0）時

- (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));
}

　　

　　二、父視圖bounds座標爲（－20，－20）時　

- (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));
｝

　　

2、frame

　　修改時改變了本身的在父視圖座標系統（bounds座標系統）的位置，自身位置和

　　子視圖位置都會被改變。

　　一、父視圖frame座標（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));
｝

　　

　　二、父視圖frame座標（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));
｝

　　

3、說明

　　根視圖只能修改bounds座標，而不能夠修改frame座標

　　如下self.view爲根視圖

　　一、初始狀態

- (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];
｝

　　

　　二、修改bounds座標：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));
｝

　　　

　　　

　　三、修改frame座標：無效

- (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));
｝