如今對個人圖檔的美化可所謂，天花亂醉。今天，就和大家一起進入一個美麗的世界。
第一步：首先，了解一個重要的知識，如下：
UIImage和UIView使用的是左上原點坐标，Core Image和Core Graphics使用的是左下原點坐标
第二部：效果圖預覽。
第二部：我們就要上代碼了。代碼一共 266行。不好之處，請多包含。
#import "ViewController.h"
@interface ViewController ()
{
@protected
//建立圖像上下文
CIContext * Context ;
// 建立顯示圖檔的控件
UIImageView * ImageV;
//我們要處理的圖像
CIImage * WillDoImage;
//處理後，我們得到的圖像
CIImage * OutImage;
//添加濾鏡鏡頭
CIFilter * Filter_zsj;
@public
// 濾鏡功能背景圖
UIView * View ;
}
@property(nonatomic,strong) NSMutableArray * AllPointArray;
// 标記是否可以塗鴉
@property(nonatomic,assign) BOOL TuYaBool;
//系統暫時圖像
@property(nonatomic,strong) UIImage * Temp_Image;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.AllPointArray = [NSMutableArray arrayWithCapacity:0];
self.Temp_Image = [UIImage imageNamed:@"4673e28380ac5b03ab2f8da9bb78d9e4.jpg"];
[self loadNav];
[self makeUI];
// 建立濾鏡的功能按鈕
[self filterBtn];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)loadNav{
UILabel * Nav_Label = [[UILabel alloc]initWithFrame:CGRectMake(self.view.bounds.size.width/2-100, 20, 200, 44)];
Nav_Label.textAlignment = NSTextAlignmentCenter;
Nav_Label.text = @"成功QQ吧提供--濾鏡";
Nav_Label.textColor = [UIColor magentaColor];
Nav_Label.font = [UIFont fontWithName:@"" size:22];
Nav_Label.shadowColor = [UIColor lightGrayColor];
Nav_Label.shadowOffset = CGSizeMake(5, -5);
[self.view addSubview:Nav_Label];
UIView * Line =[[UIView alloc] initWithFrame:CGRectMake(0, 63.5, self.view.bounds.size.width, 0.5) ];
Line.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview: Line];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//圖形布局
-(void)makeUI{
// 添加加載控件（image）
ImageV = [[UIImageView alloc]initWithFrame:CGRectMake(0, 65, self.view.bounds.size.width, self.view.bounds.size.height-65)];
// 設定圖檔的顯示模式
ImageV.contentMode = UIViewContentModeScaleToFill;
//顯示圖像
[self.view addSubview:ImageV];
// 建立圖像上下文
[self getcontext];
// 建立濾鏡，鏡頭
[self createFilter];
//開始繪圖
[self createImage];
// 進行圖檔的顯示
[self showImage];
}
-(void)getcontext{
// 直接擷取，以免處理優先級降低
Context = [CIContext contextWithOptions:nil];
// 第二種：
// 使用OpenGl 我們選着 最低的版本
// 還有第三種
}
-(void)createFilter{
Filter_zsj = [CIFilter filterWithName:@"CIColorControls"] ;
}
-(void)createImage{
ImageV.image = self.Temp_Image;
//擷取圖像
WillDoImage = [CIImage imageWithCGImage:ImageV.image.CGImage];
//讓濾鏡鏡頭捕捉到她
[Filter_zsj setValue:WillDoImage forKey:@"inputImage"];
}
-(void)showImage{
// 擷取濾鏡後的圖檔
CIImage * OverImage = [Filter_zsj outputImage];
// 建立圖像上下文
// extent Extent(xmin, ymin, xmax, ymax, spatialReference) 建立一個範圍對象。坐标表示邊界框左下角和右上角的坐标
CGImageRef ImageRef = [Context createCGImage:OverImage fromRect: [OverImage extent]];
// 從圖像上下文擷取圖像
ImageV.image = [UIImage imageWithCGImage:ImageRef];
CGImageRelease(ImageRef);
}
-(void)filterBtn{
UIView * Filter_View = [[UIView alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-50, self.view.frame.size.width, 50)];
Filter_View.backgroundColor = [UIColor cyanColor];
[self.view addSubview:Filter_View];
NSArray * Btn_titleArray = @[@"濾鏡",@"磨皮",@"瘦身",@"塗鴉"];
for (int i =0 ;i< Btn_titleArray.count ;i++){
UIButton * Button = [UIButton buttonWithType:UIButtonTypeCustom];
Button.frame = CGRectMake(10 + i* (80+(self.view.frame.size.width-340)/3), 5, 80, 40);
Button.layer.cornerRadius = 6;
[Button.layer setBorderWidth: 0.5];
Button.tag = i;
[Button setTitle:Btn_titleArray[i] forState:UIControlStateNormal];
[Button addTarget:self action:@selector(filterClick:) forControlEvents:UIControlEventTouchUpInside];
[Filter_View addSubview:Button];
}
}
//圖像濾鏡處理
-(void)filterClick:(UIButton*)filterbtn{
switch (filterbtn.tag) {
case 0:
{
if (filterbtn.selected) {
filterbtn.selected = NO;
[self deallocView];
}else{
filterbtn.selected = YES;
[self filterstar];
}
}
break;
case 1:{
}
break;
case 2:
break;
case 3:
if (filterbtn.selected) {
filterbtn.selected = NO;
self.TuYaBool = NO;
}else{
filterbtn.selected = YES;
self.TuYaBool = YES;
}
break;
default:
break;
}
}
-(void)filterstar{
View = [[UIView alloc]initWithFrame:CGRectMake(10, self.view.frame.size.height-210, self.view.frame.size.width-20, 150)];
View.backgroundColor = [UIColor whiteColor];
View.layer.cornerRadius = 6;
[self.view addSubview:View];
NSArray * ColoerFunction = @[@"亮 度 :",@"飽和度 :",@"對比度 :"];
for (int i =0 ; i< ColoerFunction.count; i++) {
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(10,10+ i * 50, 70, 40)];
label.text = ColoerFunction[i];
label.textColor = [UIColor redColor];
[View addSubview:label];
UISlider * Slider = [[UISlider alloc]initWithFrame:CGRectMake(CGRectGetMaxX(label.frame), 10+ i * 50, CGRectGetWidth(View.frame)-CGRectGetWidth(label.frame)-25, 40)];
Slider.maximumValue = 1.0;
Slider.minimumValue = 0.0;
Slider.tag = 100+i;
Slider.thumbTintColor = [UIColor greenColor];
Slider.maximumTrackTintColor = [UIColor purpleColor];
[Slider addTarget:self action:@selector(slider:) forControlEvents:UIControlEventValueChanged];
[View addSubview:Slider];
}
}
// 背景圖的消失
-(void)deallocView{
[View removeFromSuperview];
}
// 功能
-(void)slider:(UISlider*)slider{
switch (slider.tag - 100) {
case 0:{
// 亮度
[Filter_zsj setValue:[NSNumber numberWithFloat:slider.value] forKey:@"inputBrightness"];
[self showImage];
}
break;
case 1:{
// 飽和度 注意：飽和度的數值
[Filter_zsj setValue:[NSNumber numberWithFloat:(1.0-slider.value)] forKey:@"inputSaturation"];
[self showImage];
}
break;
case 2:{
// 對比度
[Filter_zsj setValue:[NSNumber numberWithFloat:(1.0-slider.value)] forKey:@"inputContrast"];
[self showImage];
}
break;
default:
break;
}
}
// 塗鴉
-(void)tuya{
// 擷取圖像的上下文
for (int i = 0 ; i<_AllPointArray.count; i++) {
for (int j =0 ; j<(int)([_AllPointArray[i] count]-1); j++) {
UIGraphicsBeginImageContext(ImageV.frame.size);
[ImageV.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height-65)];
// 取得第一個
CGPoint onepoint = [_AllPointArray[i][j] CGPointValue];
// 擷取下一個
CGPoint nextpoint = [_AllPointArray[i][j+1] CGPointValue];
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), onepoint.x, onepoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), nextpoint.x, nextpoint.y);
[[UIColor redColor] set];
CGContextDrawPath(UIGraphicsGetCurrentContext(), kCGPathStroke);
ImageV.image = UIGraphicsGetImageFromCurrentImageContext();
}
}
self.Temp_Image = ImageV.image;
[self createImage];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
if (self.TuYaBool) {
NSMutableArray * pointArray = [NSMutableArray arrayWithCapacity:0];
[_AllPointArray addObject:pointArray];
}
}
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
if (self.TuYaBool) {
UITouch * touch = [touches anyObject];
CGPoint point = [touch locationInView:ImageV];
NSValue * value = [NSValue valueWithCGPoint:point];
[[_AllPointArray lastObject] addObject:value];
[self tuya];
}
}
@end