IOS7中自動計算label的寬度和高度的方法

標籤：

 1 #import "ViewController.h" 2  3 @implementation ViewController 4  5 - (void)viewDidLoad { 6     [super viewDidLoad]; 7   8     //根據固定的寬度計算 計算label的高度 9     [self sizeToLabelHeight];10     11     //根據固定的高度 計算label的寬度12     [self sizeToLabelWidth];13     14 }15 16 /**17  *  自動計算label的寬度  前提高度固定18  *19  */20 - (void)sizeToLabelWidth21 {22     UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];23     label.textColor = [UIColor whiteColor];24     label.font = [UIFont systemFontOfSize:13];25     label.numberOfLines = 0; //這個屬性 一定要設定為0   0表示自動換行   預設是1 不換行26     label.backgroundColor = [UIColor blackColor];27     label.textAlignment = NSTextAlignmentLeft;28     NSString *str = @"fsdfsfnksdfjsdkhfjksdhfjdolfsdfsfnksdfjsdkhfjksdhfjsdkhfjksdhfjdojdol";29     30     31     //第一種方式32     //    CGSize size = [str sizeWithFont:label.font constrainedToSize: CGSizeMake(MAXFLOAT,label.frame.size.height) lineBreakMode:NSLineBreakByWordWrapping];33     34     //第二種方式35     36     NSMutableDictionary *attrs = [NSMutableDictionary dictionary];37     attrs[NSFontAttributeName] = [UIFont systemFontOfSize:13];38     39     CGSize size =  [str boundingRectWithSize:CGSizeMake( MAXFLOAT,label.frame.size.height) options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;40     41     label.frame = CGRectMake(5, 0, size.width, 100);42     label.text = str;43     44     [self.view addSubview:label];45 }46 47 48 /**49  *  自動計算label的高度  前提 ：寬度固定50  */51 - (void)sizeToLabelHeight52 {53 54     UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];55     label.textColor = [UIColor whiteColor];56     label.font = [UIFont systemFontOfSize:13];57     label.numberOfLines = 0;//這個屬性 一定要設定為0   0表示自動換行   預設是1 不換行58     label.backgroundColor = [UIColor blackColor];59     label.textAlignment = NSTextAlignmentLeft;60     61     NSString *str = @"fsdfsfnksdfjsdkhfjksdhfjdolfsdfsfnksdfjsdkhfjksdhfjsdkhfjksdhfjdojdol";62     63     //第一種方式64     //    CGSize size = [str sizeWithFont:label.font constrainedToSize: CGSizeMake(label.frame.size.width, MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping];65     66     //第二種方式67     NSMutableDictionary *attrs = [NSMutableDictionary dictionary];68     attrs[NSFontAttributeName] = [UIFont systemFontOfSize:13];69     70     CGSize size =  [str boundingRectWithSize:CGSizeMake(label.frame.size.width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;71     72     label.frame = CGRectMake(100, 100, 100, size.height);73     label.text = str;74     75     [self.view addSubview:label];76 }77 78 79 @end

 

IOS7中自動計算label的寬度和高度的方法