Ryan Olson
6b98f38a82
https://developer.apple.com/library/ios/samplecode/UICatalog/Introduction/Intro.html
240 lines
8.7 KiB
Objective-C
240 lines
8.7 KiB
Objective-C
/*
|
|
File: AAPLPickerViewController.m
|
|
Abstract: A view controller that demonstrates how to use UIPickerView.
|
|
Version: 2.12
|
|
|
|
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
|
|
Inc. ("Apple") in consideration of your agreement to the following
|
|
terms, and your use, installation, modification or redistribution of
|
|
this Apple software constitutes acceptance of these terms. If you do
|
|
not agree with these terms, please do not use, install, modify or
|
|
redistribute this Apple software.
|
|
|
|
In consideration of your agreement to abide by the following terms, and
|
|
subject to these terms, Apple grants you a personal, non-exclusive
|
|
license, under Apple's copyrights in this original Apple software (the
|
|
"Apple Software"), to use, reproduce, modify and redistribute the Apple
|
|
Software, with or without modifications, in source and/or binary forms;
|
|
provided that if you redistribute the Apple Software in its entirety and
|
|
without modifications, you must retain this notice and the following
|
|
text and disclaimers in all such redistributions of the Apple Software.
|
|
Neither the name, trademarks, service marks or logos of Apple Inc. may
|
|
be used to endorse or promote products derived from the Apple Software
|
|
without specific prior written permission from Apple. Except as
|
|
expressly stated in this notice, no other rights or licenses, express or
|
|
implied, are granted by Apple herein, including but not limited to any
|
|
patent rights that may be infringed by your derivative works or by other
|
|
works in which the Apple Software may be incorporated.
|
|
|
|
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
|
|
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
|
|
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
|
|
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
|
|
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
|
|
|
|
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
|
|
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
|
|
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
|
|
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
|
|
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
Copyright (C) 2014 Apple Inc. All Rights Reserved.
|
|
|
|
*/
|
|
|
|
#import "AAPLPickerViewController.h"
|
|
|
|
typedef NS_ENUM(NSInteger, AAPLPickerViewControllerColorComponent) {
|
|
AAPLColorComponentRed = 0,
|
|
AAPLColorComponentGreen,
|
|
AAPLColorComponentBlue,
|
|
AAPLColorComponentCount
|
|
};
|
|
|
|
// The maximum RGB color
|
|
#define AAPL_RGB_MAX 255.0
|
|
|
|
@interface AAPLPickerViewController()<UIPickerViewDataSource, UIPickerViewDelegate, UIPickerViewAccessibilityDelegate>
|
|
|
|
@property (nonatomic, weak) IBOutlet UIPickerView *pickerView;
|
|
@property (nonatomic, weak) IBOutlet UIView *colorSwatchView;
|
|
|
|
@property (nonatomic) CGFloat redColorComponent;
|
|
@property (nonatomic) CGFloat greenColorComponent;
|
|
@property (nonatomic) CGFloat blueColorComponent;
|
|
|
|
@end
|
|
|
|
|
|
#pragma mark -
|
|
|
|
@implementation AAPLPickerViewController
|
|
|
|
- (void)viewDidLoad {
|
|
[super viewDidLoad];
|
|
|
|
// Show that a given row is selected. This is off by default.
|
|
self.pickerView.showsSelectionIndicator = YES;
|
|
|
|
[self configurePickerView];
|
|
}
|
|
|
|
// The offset of each color value (from 0 to 255) for red, green, and blue.
|
|
- (NSInteger)colorValueOffset {
|
|
return 5;
|
|
}
|
|
|
|
- (NSInteger)numberOfColorValuesPerComponent {
|
|
return (NSInteger)ceil(AAPL_RGB_MAX / (CGFloat)[self colorValueOffset]) + 1;
|
|
}
|
|
|
|
- (void)updateColorSwatchViewBackgroundColor {
|
|
self.colorSwatchView.backgroundColor = [UIColor colorWithRed:self.redColorComponent green:self.greenColorComponent blue:self.blueColorComponent alpha:1];
|
|
}
|
|
|
|
|
|
#pragma mark - Configuration
|
|
|
|
- (void)configurePickerView {
|
|
// Set the default selected rows (the desired rows to initially select will vary by use case).
|
|
[self selectRowInPickerView:13 withColorComponent:AAPLColorComponentRed];
|
|
[self selectRowInPickerView:41 withColorComponent:AAPLColorComponentGreen];
|
|
[self selectRowInPickerView:24 withColorComponent:AAPLColorComponentBlue];
|
|
}
|
|
|
|
- (void)selectRowInPickerView:(NSInteger)row withColorComponent:(AAPLPickerViewControllerColorComponent)colorComponent {
|
|
// Note that the delegate method on UIPickerViewDelegate is not triggered when manually calling -[UIPickerView selectRow:inComponent:animated:].
|
|
// To do this, we fire off the delegate method manually.
|
|
[self.pickerView selectRow:row inComponent:(NSInteger)colorComponent animated:YES];
|
|
[self pickerView:self.pickerView didSelectRow:row inComponent:(NSInteger)colorComponent];
|
|
}
|
|
|
|
|
|
#pragma mark - RGB Color Setter Overrides
|
|
|
|
- (void)setRedColorComponent:(CGFloat)redColorComponent {
|
|
if (_redColorComponent != redColorComponent) {
|
|
_redColorComponent = redColorComponent;
|
|
|
|
[self updateColorSwatchViewBackgroundColor];
|
|
}
|
|
}
|
|
|
|
- (void)setGreenColorComponent:(CGFloat)greenColorComponent {
|
|
if (_greenColorComponent != greenColorComponent) {
|
|
_greenColorComponent = greenColorComponent;
|
|
|
|
[self updateColorSwatchViewBackgroundColor];
|
|
}
|
|
}
|
|
|
|
- (void)setBlueColorComponent:(CGFloat)blueColorComponent {
|
|
if (_blueColorComponent != blueColorComponent) {
|
|
_blueColorComponent = blueColorComponent;
|
|
|
|
[self updateColorSwatchViewBackgroundColor];
|
|
}
|
|
}
|
|
|
|
|
|
#pragma mark - UIPickerViewDataSource
|
|
|
|
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
|
|
return AAPLColorComponentCount;
|
|
}
|
|
|
|
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
|
|
return [self numberOfColorValuesPerComponent];
|
|
}
|
|
|
|
|
|
#pragma mark - UIPickerViewDelegate
|
|
|
|
- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component {
|
|
NSInteger colorValue = row * [self colorValueOffset];
|
|
|
|
CGFloat colorComponent = (CGFloat)colorValue / AAPL_RGB_MAX;
|
|
CGFloat redColorComponent = 0;
|
|
CGFloat greenColorComponent = 0;
|
|
CGFloat blueColorComponent = 0;
|
|
|
|
switch (component) {
|
|
case AAPLColorComponentRed:
|
|
redColorComponent = colorComponent;
|
|
break;
|
|
case AAPLColorComponentGreen:
|
|
greenColorComponent = colorComponent;
|
|
break;
|
|
case AAPLColorComponentBlue:
|
|
blueColorComponent = colorComponent;
|
|
break;
|
|
default:
|
|
NSLog(@"Invalid row/component combination for picker view.");
|
|
break;
|
|
}
|
|
|
|
UIColor *foregroundColor = [UIColor colorWithRed:redColorComponent green:greenColorComponent blue:blueColorComponent alpha:1];
|
|
|
|
NSString *titleText = [NSString stringWithFormat:@"%ld", (long)colorValue];
|
|
|
|
// Set the foreground color for the attributed string.
|
|
NSDictionary *attributes = @{NSForegroundColorAttributeName: foregroundColor};
|
|
NSAttributedString *title = [[NSAttributedString alloc] initWithString:titleText attributes:attributes];
|
|
|
|
return title;
|
|
}
|
|
|
|
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
|
|
CGFloat colorComponentValue = ((CGFloat)[self colorValueOffset] * row)/AAPL_RGB_MAX;
|
|
|
|
switch (component) {
|
|
case AAPLColorComponentRed:
|
|
self.redColorComponent = colorComponentValue;
|
|
break;
|
|
|
|
case AAPLColorComponentGreen:
|
|
self.greenColorComponent = colorComponentValue;
|
|
break;
|
|
|
|
case AAPLColorComponentBlue:
|
|
self.blueColorComponent = colorComponentValue;
|
|
break;
|
|
|
|
default:
|
|
NSLog(@"Invalid row/component combination selected for picker view.");
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
#pragma mark - UIPickerViewAccessibilityDelegate
|
|
|
|
- (NSString *)pickerView:(UIPickerView *)pickerView accessibilityLabelForComponent:(NSInteger)component {
|
|
NSString *accessibilityLabel;
|
|
|
|
switch (component) {
|
|
case AAPLColorComponentRed:
|
|
accessibilityLabel = NSLocalizedString(@"Red color component value", nil);
|
|
break;
|
|
|
|
case AAPLColorComponentGreen:
|
|
accessibilityLabel = NSLocalizedString(@"Green color component value", nil);
|
|
break;
|
|
|
|
case AAPLColorComponentBlue:
|
|
accessibilityLabel = NSLocalizedString(@"Blue color component value", nil);
|
|
break;
|
|
|
|
default:
|
|
NSLog(@"Invalid row/component combination for picker view.");
|
|
break;
|
|
}
|
|
|
|
return accessibilityLabel;
|
|
}
|
|
|
|
@end
|