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我在我的ViewController中有一個名爲chordName的NSString變量，它是從單獨的TableViewController設置的值。 我想再次傳遞這個變量，以便在ViewController中的自定義視圖中使用。如何從自定義UIView中的ViewController傳遞數據
我將如何傳遞變量從這裏（viewcontroller.m）
#import "P15ViewController.h"
#import "P15AppDelegate.h"
@interface P15ViewController()
@end
@implementation P15ViewController
@synthesize intLabel;
@synthesize chordNameLabel;
@synthesize chordName;
- (void)viewDidLoad
{
self.guitarStringView.delegate = self;
chordNameLabel.text = chordName;
[super viewDidLoad];
}
-(void)guitarStringsView:(GuitarStringsView*)view stringPlucked:(int)index withVelocity:(float)velocity;
{
P15AppDelegate* app = [[UIApplication sharedApplication] delegate];
[app play:index velocity:velocity];
}
@end
進入了UIView類drawRect方法中使用。 我還是新手，所以讓我知道你是否需要更多的代碼。
感謝
//編輯 - 這裏是自定義視圖類：
.h
#import <UIKit/UIKit.h>
@class GuitarStringsView;
@protocol GuitarStringsViewDelegate <NSObject>
-(void)guitarStringsView:(GuitarStringsView*)view stringPlucked:(int)index withVelocity:(float)velocity;
@end
@interface GuitarStringsView : UIView
@property (nonatomic) int stringCount;
@property (weak, nonatomic) id <GuitarStringsViewDelegate> delegate;
@end
.M
@interface GuitarStringsView()
@property (nonatomic, strong) NSMutableArray* touches;
@property (nonatomic, strong) NSMutableArray* timestamps;
@end
@implementation GuitarStringsView
@synthesize stringCount = _stringCount;
- (id)initWithFrame:(CGRect)frame
{
if ([super initWithFrame:frame])
{
[self commonInit];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
if ([super initWithCoder:aDecoder])
{
[self commonInit];
}
return self;
}
- (void)commonInit
{
// initialise string count and the arrays to log the touches
self.stringCount = 1;
self.touches = [[NSMutableArray alloc] initWithCapacity:2];
self.timestamps = [[NSMutableArray alloc] initWithCapacity:2];
}
// stringCount getter
-(int)stringCount
{
return _stringCount;
}
// stringCount setter
-(void)setStringCount:(int)stringCount
{
// clip to >= 1
if (stringCount < 1)
stringCount = 1;
// if changed
if (stringCount != _stringCount)
{
// update
_stringCount = stringCount;
// tell the system it needs to redraw this view
[self setNeedsDisplay];
}
}
// drawing
- (void)drawRect:(CGRect)rect
{
// get the "context" which is the place to which we will draw
CGContextRef currentContext = UIGraphicsGetCurrentContext();
// save the state (colours, pen width etc) so we can restore it when we're done
CGContextSaveGState(currentContext);
// set up fill and stroke colours
CGContextSetRGBFillColor(currentContext, 0.5, 0.0, 0.0, 1.0); // dark red
CGContextSetRGBStrokeColor(currentContext, 0.0, 0.0, 0.0, 1.0); // black
// set the stroke pen width
CGContextSetLineWidth(currentContext, 1);
// fill whole view with fill colour
CGContextFillRect(currentContext, rect);
// calculate geometry, divided screen into N sections where N is stringCount + 1
const int divisions = self.stringCount + 1;
const CGFloat divisionWidth = self.bounds.size.width/divisions;
// start at the first string
CGFloat stringX = divisionWidth;
for (int i = 0; i < self.stringCount; ++i, stringX += divisionWidth) // move to next string position each time
{
// add a line to the path
CGContextMoveToPoint(currentContext, stringX, 0);
CGContextAddLineToPoint(currentContext, stringX, self.bounds.size.height);
}
// draw the path (the strings)
CGContextStrokePath(currentContext);
// restore the context
CGContextRestoreGState(currentContext);
//Draw frets
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 2.0);
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGFloat components[] = {0.0, 0.0, 1.0, 1.0};
CGColorRef color = CGColorCreate(colorspace, components);
CGContextSetStrokeColorWithColor(context, color);
for (int i = 1; i < 5; ++i) // move to next fret position each time
{
// add a line to the path
CGContextMoveToPoint(context, 1, (i * 100));
CGContextAddLineToPoint(context, 300, (i * 100));
}
CGContextStrokePath(context);
CGColorSpaceRelease(colorspace);
CGColorRelease(color);
//draw finger markers
CGColorRef red = [[UIColor redColor] CGColor];
CGContextRef fingerContext = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(fingerContext, red);
CGContextFillEllipseInRect(context, CGRectMake(60, 140, 40, 40));
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
{
// iterate over the touches
for (UITouch* touch in touches)
{
// find just the touches that have just begun (finger down)
if (touch.phase == UITouchPhaseBegan)
{
// add the touch to the touches array
[self.touches addObject:touch];
// get the timestamp of the touch and add that as an NSNumber to the timestamps array
NSNumber* timestamp = [NSNumber numberWithDouble:touch.timestamp];
[self.timestamps addObject:timestamp];
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
// calculate geometry, divided screen into N sections where N is stringCount + 1
const int divisions = self.stringCount + 1;
const CGFloat divisionWidth = self.bounds.size.width/divisions;
// iterate over the touches
for (UITouch* touch in touches)
{
// find just the touches that have just moved
if (touch.phase == UITouchPhaseMoved)
{
// compare the timestamps of the last time we saw this touch and now
// to get the duration since we last saw this touch
const int timestampIndex = [self.touches indexOfObject:touch];
NSNumber* prevTimestampObject = self.timestamps[timestampIndex];
const NSTimeInterval prevTimestamp = [prevTimestampObject doubleValue];
const NSTimeInterval thisTimestamp = touch.timestamp;
const NSTimeInterval duration = thisTimestamp - prevTimestamp;
// get the previous and current x positions of this touch
const CGFloat hereX = [touch locationInView:self].x;
const CGFloat prevX = [touch previousLocationInView:self].x;
CGFloat stringX = divisionWidth;
// iterate over the strings
for (int i = 0; i < self.stringCount; ++i, stringX += divisionWidth)
{
// did the touch cross this string since the last time we saw this touch?
if (((prevX < stringX) && (hereX >= stringX)) ||
((prevX > stringX) && (hereX <= stringX)))
{
// calculate a velocity value based on the speed the finger was moving
const CGFloat distance = fabsf (hereX - prevX)/self.bounds.size.width;
const CGFloat velocity = (distance/duration)/self.stringCount;
// send the pluck message to our delegate, clipping velocity to <= 1
[self.delegate guitarStringsView:self
stringPlucked:i
withVelocity:velocity < 1 ? velocity : 1.f];
}
}
// update the strored timestamp for this touch for next time
self.timestamps[timestampIndex] = [NSNumber numberWithDouble:thisTimestamp];
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
// iterate over the touches
for (UITouch* touch in touches)
{
// just get touches that have ended or have been cancelled
if ((touch.phase == UITouchPhaseEnded) ||
(touch.phase == UITouchPhaseCancelled))
{
// get the index of this touch in our touches array
const int index = [self.touches indexOfObject:touch];
// remove the touch from the touches array
[self.touches removeObjectAtIndex:index];
// remove the associated timestamp
[self.timestamps removeObjectAtIndex:index];
}
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
// do same as touchesEnded: in this case
[self touchesEnded:touches withEvent:event];
}
@end
請添加您的自定義視圖代碼。那麼我們可以幫助你更好。 – Jassi 2015-04-03 16:15:27
將其添加到問題 – 2015-04-03 16:21:56
我已添加答案。請檢查。 – Jassi 2015-04-03 16:29:59