Feature source code (sector progress) and Delegate are used in open events, sector delegate
1: Slice progress view and Application
First, create a slice view and input the progress value.
#import <UIKit/UIKit.h>@interface LHProgressView : UIView@property (nonatomic) float progress;@end
#import "LHProgressView.h"#define MinProgress (1.0 / 16.0)@implementation LHProgressView- (id)initWithFrame:(CGRect)frame{ if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor clearColor]; _progress = MinProgress; } return self;}- (void)drawRect:(CGRect)rect{ CGContextRef context = UIGraphicsGetCurrentContext(); CGContextFillPath(context); CGRect aRect= CGRectMake(2, 2, self.bounds.size.width - 4, self.bounds.size.height - 4); CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 0.9); CGContextSetLineWidth(context, 2.0); CGContextAddEllipseInRect(context, aRect); CGContextDrawPath(context, kCGPathStroke); CGFloat centerX = self.bounds.size.width / 2; CGFloat centerY = self.bounds.size.height / 2; UIColor *aColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.9]; CGContextSetFillColorWithColor(context, aColor.CGColor); CGContextSetLineWidth(context, 0.0); CGContextMoveToPoint(context, centerX, centerY); CGContextAddArc(context, centerX, centerY, (self.bounds.size.width - 10) / 2, - M_PI_2, - M_PI_2 + self.progress * 2 *M_PI, 0); CGContextClosePath(context); CGContextDrawPath(context, kCGPathFillStroke);}- (void)setProgress:(float)progress{ _progress = progress; if (_progress < MinProgress) { _progress = MinProgress; } if (_progress >= 1.0) { [self setNeedsDisplay]; [self removeFromSuperview]; } else { [self setNeedsDisplay]; } }@end
Application:
@property(nonatomic, strong)LHProgressView *progressView;
-(instancetype)initWithFrame:(CGRect)frame{ if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor clearColor]; _progressView = [[LHProgressView alloc] init]; } return self;}
- (void)setItemImageUrl:(NSString *)itemImageUrl{ _itemImageUrl = itemImageUrl; BOOL imageExist = [[SDWebImageManager sharedManager] cachedImageExistsForURL:[NSURL URLWithString:itemImageUrl]]; if (_itemImageProgress == 1.0 || imageExist) { [_progressView removeFromSuperview]; } else { _progressView.bounds = CGRectMake(0, 0, 50, 50); _progressView.center = CGPointMake((self.bounds.size.width) / 2, (self.bounds.size.height) / 2); [self addSubview:_progressView]; _progressView.progress = _itemImageProgress; } _itemImageView.image = _itemImage; [self resetSize]; __weak LHProgressView *progressView = _progressView; __weak LHPhotoView *photoView = self; NSInteger index = self.tag - 1; [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:itemImageUrl] options:SDWebImageRetryFailed | SDWebImageLowPriority progress:^(NSInteger receivedSize, NSInteger expectedSize) { if ([photoView.photoViewDelegate respondsToSelector:@selector(photoIsShowingPhotoViewAtIndex:)]) { BOOL isShow = [photoView.photoViewDelegate photoIsShowingPhotoViewAtIndex:index]; if (isShow) { if (receivedSize > kMinProgress) { progressView.progress = (float)receivedSize/expectedSize; } } } if ([photoView.photoViewDelegate respondsToSelector:@selector(updatePhotoProgress:andIndex:)]) { [photoView.photoViewDelegate updatePhotoProgress:(float)receivedSize/expectedSize andIndex:index]; } } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) { if (image) { if ([photoView.photoViewDelegate respondsToSelector:@selector(photoIsShowingPhotoViewAtIndex:)]) { BOOL isShow = [photoView.photoViewDelegate photoIsShowingPhotoViewAtIndex:index]; if (isShow) { photoView.itemImageView.image = image; [self resetSize]; } } if ([photoView.photoViewDelegate respondsToSelector:@selector(updatePhotoProgress:andIndex:)]) { [photoView.photoViewDelegate updatePhotoProgress:1.0 andIndex:index]; } } }]; }
Note: In break, you must first process the object _ weak LHProgressView * progressView = _ progressView. The above also uses SDWebImage to load images and assign progress values.
2: Using Delegate in Open events
#import <UIKit/UIKit.h>@class DMDropDownMenu;@protocol DMDropDownMenuDelegate <NSObject>- (void)selectIndex:(NSInteger)index AtDMDropDownMenu:(DMDropDownMenu *)dmDropDownMenu;@end
@interface DMDropDownMenu : UIView@property(nonatomic,assign)id<DMDropDownMenuDelegate>delegate;@end
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ [self tapAction]; _curText.text = self.listArr[indexPath.row]; if ([_delegate respondsToSelector:@selector(selectIndex:AtDMDropDownMenu:)]) { [_delegate selectIndex:indexPath.row AtDMDropDownMenu:self]; }}
Three-Step code for application:
@interface ViewController ()<DMDropDownMenuDelegate>@end DMDropDownMenu * dm1 = [[DMDropDownMenu alloc] initWithFrame:CGRectMake(10, 150, 299, 30)]; dm1.delegate = self; [self.view addSubview:dm1];- (void)selectIndex:(NSInteger)index AtDMDropDownMenu:(DMDropDownMenu *)dmDropDownMenu{ NSLog(@"dropDownMenu:%@ index:%d",dmDropDownMenu,index);}