最近项目需要实现数据随机显示在视图上，并且点击空白重新刷新，经过探索，终于实现随机显示。。。下面开始说明！
首先介绍一下个人思路，简单来说，每一个Label上显示的文字，可以用[string sizeWithFont:]之类的函数算出size，然后随机一个origin来生成一个frame，然后依次处理每个Label，将正在处理的Label的frame和前面已设置好Label的frame进行一下判断，使用CGRectIntersectsRect来判断是否有交集，同时还要判断该Label是否超出视图View,如果有交集或超出则重新生成点
直接上代码：
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
NSArray *bklist=@[@"CSDN",@"IOS 7.0",@"http://blog.csdn.net/lsy2013",@"www.baidu.com"];
list=[[NSMutableArray alloc]initWithArray:bklist];
self.backgroundColor=[UIColor whiteColor];
[self initBkList:bklist];
[self setUserInteractionEnabled:YES];
UITapGestureRecognizer *tapGestureTel = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(viewReload)];
[self addGestureRecognizer:tapGestureTel];
}
return self;
}
-(void)initBkList:(NSArray *)bklist//存放NSString数组
{
int locatag=0;
for (int j=0; j<bklist.count; j++)
{
UILabel * label = [[UILabel alloc]init];
label.font=[UIFont systemFontOfSize:18];
NSTimeInterval animationDuration = 0.50f;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:animationDuration];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
label.textAlignment=NSTextAlignmentLeft;
label.text=bklist[j] ;
label.frame=[self randomRect:[bklist[j] baikeTitel] AndLabelCount:j];
//label.backgroundColor = [UIColor redColor];
[self addSubview:label];
[UIView commitAnimations];
}
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
-(CGSize)labelAuto:(NSString *)str
{
UIFont * tfont = [UIFont systemFontOfSize:18];
CGSize size =CGSizeMake(1024,50);
NSDictionary * tdic = [NSDictionary dictionaryWithObjectsAndKeys:tfont,NSFontAttributeName,nil];
CGSize actualsize =[str boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:tdic context:nil].size;
return actualsize;
}
-(CGRect)randomRect:(NSString *)str AndLabelCount:(NSInteger)count
{
BOOL isIntersect=NO;
int x = arc4random() % (int)self.frame.size.width;
int y = arc4random() % (int)self.frame.size.height;
CGSize actualsize=[self labelAuto:str];
CGRect labelFrame= CGRectMake(x, y, actualsize.width, actualsize.height);
do {
int i=0;
if ((labelFrame.origin.x+labelFrame.size.width)>self.frame.size.width||(labelFrame.origin.y+labelFrame.size.height)>self.frame.size.height)
{
isIntersect=YES;
}else
{
isIntersect=NO;
for (id obj in self.subviews)
{
if ([obj isKindOfClass:[UILabel class]])
{
i++;
UILabel * mylabel = (UILabel*)obj;
if (CGRectIntersectsRect(labelFrame,mylabel.frame))
{
isIntersect=YES;
break;
}
}
if (i==count)
{
isIntersect=NO;
}
}
}
if (isIntersect)
{
x = arc4random() % (int)self.frame.size.width;
y = arc4random() % (int)self.frame.size.height;
labelFrame= CGRectMake(x, y, actualsize.width, actualsize.height);
}
} while (isIntersect);
return labelFrame;
}
-(void)viewReload
{
for (id obj in self.subviews)
{
if ([obj isKindOfClass:[UILabel class]])
{
UILabel * mylabel = (UILabel*)obj;
[mylabel removeFromSuperview];
}
}
[self initBkList:list];
}