iOS開發UI篇—transframe屬性(形變)

iOS開發UI篇—transframe屬性(形變)app

1. transform屬性ide

在OC中,經過transform屬性能夠修改對象的平移、縮放比例和旋轉角度動畫

經常使用的建立transform結構體方法分兩大類atom

(1) 建立「基於控件初始位置」的形變spa

CGAffineTransformMakeTranslation(平移)code

CGAffineTransformMakeScale(縮放)orm

CGAffineTransformMakeRotation(旋轉)對象

 

(2) 建立「基於transform參數」的形變blog

CGAffineTransformTranslate事件

CGAffineTransformScale

CGAffineTransformRotate

 

補充:

在OC中,全部跟角度相關的數值,都是弧度值,180° = M_PI

正數表示順時針旋轉

負數表示逆時針旋轉

 

提示:因爲transform屬性能夠基於控件的上一次的狀態進行疊加形變,例如,先旋轉再平移。所以在實際動畫開發中,當涉及位置、尺寸形變效果時,大多修改控件的transform屬性,而不是frame、bounds、center 。

2.代碼示例

複製代碼

//
// YYViewController.m
// 01-練習使用按鈕的frame和center屬性
//
// Created by apple on 14-5-21.
// Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYViewController.h"

//私有擴展
@interface YYViewController ()

@property(nonatomic,weak)IBOutlet UIButton *headImageView;
@end

@implementation YYViewController

//枚舉類型,從1開始
//枚舉類型有一個很大的做用,就是用來代替程序中的魔法數字
typedef enum
{
ktopbtntag=1,
kdownbtntag,
krightbtntag,
kleftbtntag
}btntag;

//viewDidLoad是視圖加載完成後調用的方法,一般在此方法中執行視圖控制器的初始化工做
- (void)viewDidLoad
{

//在viewDidLoad方法中,不要忘記調用父類的方法實現
[super viewDidLoad];


//手寫控件代碼
//1、寫一個按鈕控件,上面有一張圖片

//1.使用類建立一個按鈕對象
// UIButton *headbtn=[[UIButton alloc] initWithFrame:CGRectMake(100 ,100, 100, 100)];
//設置按鈕對象爲自定義型
UIButton *headbtn=[UIButton buttonWithType:UIButtonTypeCustom];

//2.設置對象的各項屬性

//(1)位置等通用屬性設置
headbtn.frame=CGRectMake(100, 100, 100, 100);

//(2)設置普通狀態下按鈕的屬性
[headbtn setBackgroundImage:[UIImage imageNamed:@"i"] forState:UIControlStateNormal];
[headbtn setTitle:@"點我!" forState:UIControlStateNormal];
[headbtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

//(3)設置高亮狀態下按鈕的屬性
[headbtn setBackgroundImage:[UIImage imageNamed:@"a"] forState:UIControlStateHighlighted];
[headbtn setTitle:@"還行吧~" forState:UIControlStateHighlighted];
[headbtn setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];

//3.把對象添加到視圖中展示出來
[self.view addSubview:headbtn];
//注意點!
self.headImageView=headbtn;


//2、寫四個控制圖片左右上下移動方向的按鈕控件

/**================向上的按鈕=====================*/
//1.建立按鈕對象
UIButton *topbtn=[UIButton buttonWithType:UIButtonTypeCustom];

//2.設置對象的屬性
topbtn.frame=CGRectMake(100, 250, 40, 40);
[topbtn setBackgroundImage:[UIImage imageNamed:@"top_normal"] forState:UIControlStateNormal];
[topbtn setBackgroundImage:[UIImage imageNamed:@"top_highlighted"] forState:UIControlStateHighlighted];
[topbtn setTag:1];
//3.把控件添加到視圖中
[self.view addSubview:topbtn];

//4.按鈕的單擊控制事件
[topbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];


/**================向下的按鈕=====================*/
//1.建立按鈕對象
UIButton *downbtn=[UIButton buttonWithType:UIButtonTypeCustom];
//2.設置對象的屬性
downbtn.frame=CGRectMake(100, 350, 40, 40);
[downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_normal"] forState:UIControlStateNormal];
[downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_highlighted"] forState:UIControlStateHighlighted];
[downbtn setTag:2];
//3.把控件添加到視圖中
[self.view addSubview:downbtn];

//4.按鈕的單擊控制事件
[downbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];


/**================向左的按鈕=====================*/
//1.建立按鈕對象
UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
//2.設置對象的屬性
leftbtn.frame=CGRectMake(50, 300, 40, 40);
[leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
[leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
[leftbtn setTag:4];
//3.把控件添加到視圖中
[self.view addSubview:leftbtn];

//4.按鈕的單擊控制事件
[leftbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];



/**================向右的按鈕=====================*/
//1.建立按鈕對象
UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
//2.設置對象的屬性
rightbtn.frame=CGRectMake(150, 300, 40, 40);
[rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
[rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
[rightbtn setTag:3];
//3.把控件添加到視圖中
[self.view addSubview:rightbtn];

//4.按鈕的單擊控制事件
[rightbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];

//3、寫兩個縮放按鈕
/**================放大的按鈕=====================*/
//1.建立對象
UIButton *plusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
//2.設置屬性
plusbtn.frame=CGRectMake(75, 400, 40, 40);
[plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_normal"] forState:UIControlStateNormal];
[plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_highlighted"] forState:UIControlStateHighlighted];
[plusbtn setTag:1];
//3.添加到視圖
[self.view addSubview:plusbtn];
//4.單擊事件
[plusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];


/**================縮小的按鈕=====================*/
UIButton *minusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
minusbtn.frame=CGRectMake(125, 400, 40, 40);
[minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_normal"] forState:UIControlStateNormal];
[minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_highlighted"] forState:UIControlStateHighlighted];
[minusbtn setTag:0];
[self.view addSubview:minusbtn];
[minusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];

/**================向左旋轉按鈕=====================*/
UIButton *leftrotatebtn=[UIButton buttonWithType:UIButtonTypeCustom];
[leftrotatebtn setFrame:CGRectMake(175, 400, 40, 40)];
[leftrotatebtn setBackgroundImage:[UIImage imageNamed:@"left_rotate_normal"] forState:UIControlStateNormal];
[leftrotatebtn setBackgroundImage:[UIImage imageNamed:@"left_rotate_highlighted"] forState:UIControlStateHighlighted];
[leftrotatebtn setTag:1];
[self.view addSubview:leftrotatebtn];
[leftrotatebtn addTarget:self action:@selector(Rotate:) forControlEvents:UIControlEventTouchUpInside];

/**================向右旋轉按鈕=====================*/
UIButton *rightrotatebtn=[UIButton buttonWithType:UIButtonTypeCustom];
[rightrotatebtn setFrame:CGRectMake(225, 400, 40, 40)];
[rightrotatebtn setBackgroundImage:[UIImage imageNamed:@"right_rotate_normal"] forState:UIControlStateNormal];
[rightrotatebtn setBackgroundImage:[UIImage imageNamed:@"right_rotate_highlighted"] forState:UIControlStateHighlighted];
[rightbtn setTag:0];
[self.view addSubview:rightrotatebtn];
[rightrotatebtn addTarget:self action:@selector(Rotate:) forControlEvents:UIControlEventTouchUpInside];
}

//控制方向的多個按鈕調用同一個方法
-(void)Click:(UIButton *)button
{

//練習使用frame屬性
//CGRect frame=self.headImageView.frame;

/**注意,這裏若是控制位置的兩個屬性frame和center同時使用的話,會出現很好玩的效果,注意分析*/
//練習使用center屬性
CGPoint center=self.headImageView.center;
switch (button.tag) {
case ktopbtntag:
center.y-=30;
break;
case kdownbtntag:
center.y+=30;
break;
case kleftbtntag:
//發現一個bug,以前的問題是由於少寫了break,形成了它們的順序執行,sorry
//center.x=center.x-30;
center.x-=50;
break;
case krightbtntag:
center.x+=50;
break;
}

// self.headImageView.frame=frame;

//首尾式設置動畫效果
[UIView beginAnimations:nil context:nil];
self.headImageView.center=center;
//設置時間
[UIView setAnimationDuration:2.0];
[UIView commitAnimations];
NSLog(@"移動!");

}
-(void)Zoom:(UIButton *)btn
{
//使用bounds,以中心點位原點進行縮放
CGRect bounds = self.headImageView.bounds;
if (btn.tag) {
bounds.size.height+=30;
bounds.size.width+=30;
}
else
{
bounds.size.height-=50;
bounds.size.width-=50;
}

//設置首尾動畫
[UIView beginAnimations:nil context:nil];
self.headImageView.bounds=bounds;
[UIView setAnimationDuration:2.0];
[UIView commitAnimations];
}

-(void)Rotate:(UIButton *)rotate
{
//位移(不累加)
//self.headImageView.transform=CGAffineTransformMakeTranslation(50, 200);
//縮放
//self.headImageView.transform=CGAffineTransformMakeScale(1.2, 10);
//在原有的基礎上位移(是累加的)
//self.headImageView.transform=CGAffineTransformTranslate(self.headImageView.transform, 50, 50);
//在原有的基礎上進行縮放
//self.headImageView.transform=CGAffineTransformScale(self.headImageView.transform, 1.5, 1.6);

//在原有的基礎上進行旋轉
if (rotate.tag) {
//旋轉角度爲1/pi,逆時針
self.headImageView.transform=CGAffineTransformRotate(self.headImageView.transform, -M_1_PI);
}
else
{
//旋轉的角度爲pi/2,順時針
self.headImageView.transform=CGAffineTransformRotate(self.headImageView.transform, M_PI_2);
}

}
@end

 
 
複製代碼

實現效果:

3.viewDidLoad

viewDidLoad是視圖加載完成後調用的方法,一般在此方法中執行視圖控制器的初始化工做

在viewDidLoad方法中,必定不要忘記調用父類的方法實現

[super viewDidLoad];

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