iOS开发transform的使用

//

//  ViewController.m

//  18-transform的使用

#import "ViewController.h"

@interface ViewController ()

@property(nonatomic,assign)CGFloat ty;

- (IBAction)up:(id)sender;

- (IBAction)big;

- (IBAction)rotate;

- (IBAction)reset;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

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

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

/**

向上向下向左向右

@param sender <#sender description#>

*/

- (IBAction)up:(id)sender {

//    NSLog(@"up");

//通过父控件拿到按钮

//可以通过父类拿到子类

UIButton *headBtn = (UIButton *)[self.view viewWithTag:10];

//2 通过fransform让头像向上走

//tx 水平方向移动的范围

//ty 竖直方向移动的范围

/**

CGAffineTransformMakeTranslation

使用这个方法进行设置,每次变化都是以原始值进行

变化的

@param 0 <#0 description#>

@param -10 <#-10 description#>

@return <#return value description#>

*/

//方法1: 开辟成员变量耗性能

//    self.ty-= 10;

//    headBtn.transform = CGAffineTransformMakeTranslation(0, self.ty);

/**

方法2:

CGAffineTransformTranslate

使用这个方法每次都是以CGAffineTransform 值进行变化的

@param t#> <#t#> description#>

@param tx#> <#tx#> description#>

@param ty#> <#ty#> description#>

@return <#return value description#>

*/

headBtn.transform = CGAffineTransformTranslate(headBtn.transform, 0, -10);

}

//放大 缩小

- (IBAction)big {

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:1.5];

UIButton *headBtn = (UIButton *)[self.view viewWithTag:10];

headBtn.transform = CGAffineTransformScale(headBtn.transform, 1.5, 1.5);

[UIView commitAnimations];

}

/**

旋转

*/

- (IBAction)rotate {

UIButton *headBtn = (UIButton *)[self.view viewWithTag:10];

headBtn.transform = CGAffineTransformRotate(headBtn.transform, M_PI_4);

}

/**

复位

*/

- (IBAction)reset {

UIButton *headBtn = (UIButton *)[self.view viewWithTag:10];

headBtn.transform = CGAffineTransformIdentity;

}

@end