AnimateView.m 文件
#import "AnimateView.h"
@interface AnimateView()
@property (nonatomic, assign) CGFloat changeY;
@end
@implementation AnimateView
-(void)setChangeY:(CGFloat)changeY {
_changeY = changeY;
// [self setNeedsDisplay]; // NSTimer 调用了 这个方法， 就不需 再调用了。
}
-(void)awakeFromNib {
// view由storyBoard创建出来调用的 方法
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(setNeedsDisplay) userInfo:nil repeats:YES];
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
// self.changeY++;
self.changeY += 20;
UIImage * image = [UIImage imageNamed:@"me.png"];
[image drawAtPoint:CGPointMake(0, self.changeY)];
// 构造 重复。
if (self.changeY > [[UIScreen mainScreen ] bounds].size.height ) {
self.changeY = -10;
}
}
