IOS学习 UIView 页面布局

#import "ViewController.h"

@interface
ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super
viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

UIView *view1 = [[UIView
alloc]initWithFrame:CGRectMake(100,
100, 200,
100)];

view1.tag = 1;
//标示一个视图对象

// view1 = [self.view viewWithTag:1]; //可以通过tag查找view

view1.backgroundColor = [UIColor
redColor];

view1.clipsToBounds =
YES; //剪切掉视图外的内容

[self.view
addSubview:view1];

[view1 release];

UIView *view2 = [[UIView
alloc]initWithFrame:CGRectMake(0,
0, 100,
200)];

view2.tag = 2;

view2.backgroundColor = [UIColor
yellowColor];

[view1 addSubview:view2];

view2.alpha =
0.5; //透明度

[view2 release];

UIView *view3 = [[UIView
alloc]initWithFrame:CGRectMake(0,
0, 50,
50)];

view3.tag = 2;

view3.backgroundColor = [UIColor
greenColor];

[view1 addSubview:view3];

[view3 release];

UIButton *button = [UIButton
buttonWithType:UIButtonTypeRoundedRect];

button.frame =
CGRectMake(90,400,
140, 40);

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

[button addTarget:self
action:@selector(changeView)
forControlEvents:UIControlEventTouchUpInside];

[self.view
addSubview:button];

UILabel *label = [[UILabel
alloc]initWithFrame:CGRectMake(5,
0, 50,
30)];

label.text = @"jianguo";

label.textColor = [UIColor
whiteColor];

label.font = [UIFont
fontWithName:nil
size:14];

[view3 addSubview:label];

}

-(void)changeView{

NSLog(@"print");

UIView *vv = [self.view
viewWithTag:2];

[self.view
addSubview:vv];

NSLog(@"%@",vv);

[UIView
beginAnimations:nil
context:NULL];
//需要设置代理时

[UIView
setAnimationDuration:5];
//设置动画的持续时间

[UIView
setAnimationDelay:1];
//设置动画的延迟时间

vv.alpha = 0.0;
//淡出

// vv.backgroundColor = [UIColor blueColor];

vv.alpha = 1.0;

[UIView
commitAnimations]; //动画结束

// [UIView beginAnimations:nil context:NULL];

// [UIView setAnimationDuration:10];

// [UIView setAnimationDelay:5];

// vv.alpha = 1.0;

// [UIView setAnimationCurve:UIViewAnimationCurveLinear]; //动画的速率

// vv.center = CGPointMake(300, 500); //移动的位置

// [UIView commitAnimations];

}

- (void)didReceiveMemoryWarning {

[super
didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end