ibireme
118 lines
3.4 KiB
Objective-C
118 lines
3.4 KiB
Objective-C
//
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// YYImageProgressiveExample.m
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// YYKitExample
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//
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// Created by ibireme on 15/8/24.
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// Copyright (c) 2015 ibireme. All rights reserved.
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//
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#import "YYImageProgressiveExample.h"
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#import "YYImage.h"
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#import "UIView+YYAdd.h"
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#import "UIControl+YYAdd.h"
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@interface NSData(YYAdd)
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@end
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@implementation NSData(YYAdd)
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+ (NSData *)dataNamed:(NSString *)name {
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NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@""];
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if (!path) return nil;
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NSData *data = [NSData dataWithContentsOfFile:path];
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return data;
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}
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@end
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@interface YYImageProgressiveExample () {
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UIImageView *_imageView;
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UISegmentedControl *_seg0;
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UISegmentedControl *_seg1;
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UISlider *_slider0;
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}
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@end
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@implementation YYImageProgressiveExample
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- (void)viewDidLoad {
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[super viewDidLoad];
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self.view.backgroundColor = [UIColor whiteColor];
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_imageView = [UIImageView new];
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_imageView.size = CGSizeMake(300, 300);
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_imageView.backgroundColor = [UIColor colorWithWhite:0.790 alpha:1.000];
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_imageView.centerX = self.view.width / 2;
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_seg0 = [[UISegmentedControl alloc] initWithItems:@[@"baseline",@"progressive/interlaced"]];
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_seg0.selectedSegmentIndex = 0;
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_seg0.size = CGSizeMake(_imageView.width, 30);
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_seg0.centerX = self.view.width / 2;
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_seg1 = [[UISegmentedControl alloc] initWithItems:@[@"JPEG", @"PNG", @"GIF"]];
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_seg1.frame = _seg0.frame;
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_seg1.selectedSegmentIndex = 0;
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_slider0 = [UISlider new];
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_slider0.width = _seg0.width;
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[_slider0 sizeToFit];
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_slider0.minimumValue = 0;
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_slider0.maximumValue = 1.05;
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_slider0.value = 0;
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_slider0.centerX = self.view.width / 2;
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_imageView.top = 64 + 10;
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_seg0.top = _imageView.bottom + 10;
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_seg1.top = _seg0.bottom + 10;
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_slider0.top = _seg1.bottom + 10;
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[self.view addSubview:_imageView];
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[self.view addSubview:_seg0];
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[self.view addSubview:_seg1];
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[self.view addSubview:_slider0];
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__weak typeof(self) _self = self;
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[_seg0 addBlockForControlEvents:UIControlEventValueChanged block:^(id sender) {
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[_self changed];
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}];
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[_seg1 addBlockForControlEvents:UIControlEventValueChanged block:^(id sender) {
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[_self changed];
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}];
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[_slider0 addBlockForControlEvents:UIControlEventValueChanged block:^(id sender) {
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[_self changed];
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}];
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}
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- (void)changed {
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NSString *name = nil;
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if (_seg0.selectedSegmentIndex == 0) {
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if (_seg1.selectedSegmentIndex == 0) {
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name = @"mew_baseline.jpg";
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} else if (_seg1.selectedSegmentIndex == 1) {
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name = @"mew_baseline.png";
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} else {
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name = @"mew_baseline.gif";
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}
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} else {
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if (_seg1.selectedSegmentIndex == 0) {
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name = @"mew_progressive.jpg";
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} else if (_seg1.selectedSegmentIndex == 1) {
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name = @"mew_interlaced.png";
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} else {
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name = @"mew_interlaced.gif";
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}
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}
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NSData *data = [NSData dataNamed:name];
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float progress = _slider0.value;
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if (progress > 1) progress = 1;
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NSData *subData = [data subdataWithRange:NSMakeRange(0, data.length * progress)];
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YYImageDecoder *decoder = [[YYImageDecoder alloc] initWithScale:[UIScreen mainScreen].scale];
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[decoder updateData:subData final:NO];
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YYImageFrame *frame = [decoder frameAtIndex:0 decodeForDisplay:YES];
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_imageView.image = frame.image;
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}
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@end
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