enumerateObjectsUsingBlock的使用问题记录

来源：互联网发布：淘宝举报中心入口编辑：程序博客网时间：2024/05/12 20:24

enumerateObjectsUsingBlock

说明：类似与for in 和for 循坏。效率高，运行时间短。

用法例子：

NSArray *_arData;

_arData = @[@"是1",@"是2",@"是3",@"是4",@"是5",@"是6"];

//block引用内部变量定义规则

__blockfloat h =self.view.frame.size.height*0.7/[_arDatacount];

__blockfloat y = 0.15*self.view.frame.size.height;

[_arDataenumerateObjectsUsingBlock:^(NSString *obj,NSUInteger idx,BOOL *stop)

{

...............代码块处理....................(其中obj代表for循坏里面的每个字符串,idx代表索引下标,stop代表结束)

UIView *listV = [[UIViewalloc] initWithFrame:CGRectMake(0, y,self.view.frame.size.width, h)];

[listV setBackgroundColor:[UIColorclearColor]];

UILabel *l = [[UILabelalloc] initWithFrame:CGRectMake(60,0, listV.frame.size.width -60, listV.frame.size.height)];

[l setFont:[UIFontsystemFontOfSize:20]];

[l setTextColor:[UIColorwhiteColor]];

[l setBackgroundColor:[UIColorclearColor]];

[lsetText:obj];

l.userInteractionEnabled =YES;

l.tag = idx;

[listVaddSubview:l];

[self.viewaddSubview:listV];

y += h;

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tapAction:)];

singleTap.numberOfTapsRequired =1;

[laddGestureRecognizer:singleTap];

}];

0 0