QuartzDemo/QuartzDashViewController.m

/*
     File: QuartzDashViewController.m
 Abstract: A UIViewController subclass that manages a QuartzDashView and a UI to allow for the selection of the line dash pattern and phase.
  Version: 3.0
 
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*/
 
#import "QuartzDashViewController.h"
#import "QuartzLines.h"
 
@interface QuartzDashViewController()
 
@property(nonatomic, weak) IBOutlet QuartzDashView *quartzDashView;
 
@property(nonatomic, weak) IBOutlet UIPickerView *picker;
@property(nonatomic, weak) IBOutlet UISlider *phaseSlider;
 
@end
 
 
 
typedef struct {
    CGFloat pattern[5];
    size_t count;
} Pattern;
 
static Pattern patterns[] = {
    {{10.0, 10.0}, 2},
    {{10.0, 20.0, 10.0}, 3},
    {{10.0, 20.0, 30.0}, 3},
    {{10.0, 20.0, 10.0, 30.0}, 4},
    {{10.0, 10.0, 20.0, 20.0}, 4},
    {{10.0, 10.0, 20.0, 30.0, 50.0}, 5},
};
static NSInteger patternCount = sizeof(patterns) / sizeof(patterns[0]);
 
 
@implementation QuartzDashViewController
 
 
// Setup the picker's default components.
-(void)viewDidLoad
{
    [super viewDidLoad];
    [self.quartzDashView setDashPattern:patterns[0].pattern count:patterns[0].count];
    [self.picker selectRow:0 inComponent:0 animated:NO];
}
 
 
-(IBAction)takeDashPhaseFrom:(UISlider *)sender
{
    self.quartzDashView.dashPhase = sender.value;
}
 
 
-(IBAction)reset:sender
{
    self.phaseSlider.value = 0.0;
    self.quartzDashView.dashPhase = 0.0;
}
 
 
#pragma mark UIPickerViewDelegate & UIPickerViewDataSource methods
 
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}
 
 
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return patternCount;
}
 
 
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
    Pattern p = patterns[row];
    NSMutableString *title = [NSMutableString stringWithFormat:@"%.0f", p.pattern[0]];
    for (size_t i = 1; i < p.count; ++i)
    {
        [title appendFormat:@"-%.0f", p.pattern[i]];
    }
    return title;
}
 
 
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    [self.quartzDashView setDashPattern:patterns[row].pattern count:patterns[row].count];
}
 
 
@end